Linux* Base Driver for the Intel(R) PRO/1000 Family of Adapters
===============================================================
-November 17, 2004
+September 26, 2006
Contents
- In This Release
- Identifying Your Adapter
+- Building and Installation
- Command Line Parameters
- Speed and Duplex Configuration
- Additional Configurations
===============
This file describes the Linux* Base Driver for the Intel(R) PRO/1000 Family
-of Adapters, version 5.x.x.
+of Adapters. This driver includes support for Itanium(R)2-based systems.
-For questions related to hardware requirements, refer to the documentation
-supplied with your Intel PRO/1000 adapter. All hardware requirements listed
+For questions related to hardware requirements, refer to the documentation
+supplied with your Intel PRO/1000 adapter. All hardware requirements listed
apply to use with Linux.
-Native VLANs are now available with supported kernels.
+The following features are now available in supported kernels:
+ - Native VLANs
+ - Channel Bonding (teaming)
+ - SNMP
+
+Channel Bonding documentation can be found in the Linux kernel source:
+/Documentation/networking/bonding.txt
+
+The driver information previously displayed in the /proc filesystem is not
+supported in this release. Alternatively, you can use ethtool (version 1.6
+or later), lspci, and ifconfig to obtain the same information.
+
+Instructions on updating ethtool can be found in the section "Additional
+Configurations" later in this document.
+
+NOTE: The Intel(R) 82562v 10/100 Network Connection only provides 10/100
+support.
+
Identifying Your Adapter
========================
-For more information on how to identify your adapter, go to the Adapter &
+For more information on how to identify your adapter, go to the Adapter &
Driver ID Guide at:
http://support.intel.com/support/network/adapter/pro100/21397.htm
-For the latest Intel network drivers for Linux, refer to the following
-website. In the search field, enter your adapter name or type, or use the
+For the latest Intel network drivers for Linux, refer to the following
+website. In the search field, enter your adapter name or type, or use the
networking link on the left to search for your adapter:
http://downloadfinder.intel.com/scripts-df/support_intel.asp
+
Command Line Parameters
=======================
-If the driver is built as a module, the following optional parameters are
-used by entering them on the command line with the modprobe or insmod command
+If the driver is built as a module, the following optional parameters
+are used by entering them on the command line with the modprobe command
using this syntax:
modprobe e1000 [<option>=<VAL1>,<VAL2>,...]
- insmod e1000 [<option>=<VAL1>,<VAL2>,...]
-
For example, with two PRO/1000 PCI adapters, entering:
- insmod e1000 TxDescriptors=80,128
+ modprobe e1000 TxDescriptors=80,128
-loads the e1000 driver with 80 TX descriptors for the first adapter and 128 TX
-descriptors for the second adapter.
+loads the e1000 driver with 80 TX descriptors for the first adapter and
+128 TX descriptors for the second adapter.
The default value for each parameter is generally the recommended setting,
-unless otherwise noted. Also, if the driver is statically built into the
-kernel, the driver is loaded with the default values for all the parameters.
-Ethtool can be used to change some of the parameters at runtime.
+unless otherwise noted.
+
+NOTES: For more information about the AutoNeg, Duplex, and Speed
+ parameters, see the "Speed and Duplex Configuration" section in
+ this document.
- NOTES: For more information about the AutoNeg, Duplex, and Speed
- parameters, see the "Speed and Duplex Configuration" section in
- this document.
+ For more information about the InterruptThrottleRate,
+ RxIntDelay, TxIntDelay, RxAbsIntDelay, and TxAbsIntDelay
+ parameters, see the application note at:
+ http://www.intel.com/design/network/applnots/ap450.htm
- For more information about the InterruptThrottleRate, RxIntDelay,
- TxIntDelay, RxAbsIntDelay, and TxAbsIntDelay parameters, see the
- application note at:
- http://www.intel.com/design/network/applnots/ap450.htm
+ A descriptor describes a data buffer and attributes related to
+ the data buffer. This information is accessed by the hardware.
- A descriptor describes a data buffer and attributes related to the
- data buffer. This information is accessed by the hardware.
-AutoNeg (adapters using copper connections only)
-Valid Range: 0x01-0x0F, 0x20-0x2F
+AutoNeg
+-------
+(Supported only on adapters with copper connections)
+Valid Range: 0x01-0x0F, 0x20-0x2F
Default Value: 0x2F
- This parameter is a bit mask that specifies which speed and duplex
- settings the board advertises. When this parameter is used, the Speed and
- Duplex parameters must not be specified.
- NOTE: Refer to the Speed and Duplex section of this readme for more
- information on the AutoNeg parameter.
-
-Duplex (adapters using copper connections only)
-Valid Range: 0-2 (0=auto-negotiate, 1=half, 2=full)
+
+This parameter is a bit-mask that specifies the speed and duplex settings
+advertised by the adapter. When this parameter is used, the Speed and
+Duplex parameters must not be specified.
+
+NOTE: Refer to the Speed and Duplex section of this readme for more
+ information on the AutoNeg parameter.
+
+
+Duplex
+------
+(Supported only on adapters with copper connections)
+Valid Range: 0-2 (0=auto-negotiate, 1=half, 2=full)
Default Value: 0
- Defines the direction in which data is allowed to flow. Can be either one
- or two-directional. If both Duplex and the link partner are set to auto-
- negotiate, the board auto-detects the correct duplex. If the link partner
- is forced (either full or half), Duplex defaults to half-duplex.
+
+This defines the direction in which data is allowed to flow. Can be
+either one or two-directional. If both Duplex and the link partner are
+set to auto-negotiate, the board auto-detects the correct duplex. If the
+link partner is forced (either full or half), Duplex defaults to half-
+duplex.
+
FlowControl
-Valid Range: 0-3 (0=none, 1=Rx only, 2=Tx only, 3=Rx&Tx)
-Default: Read flow control settings from the EEPROM
- This parameter controls the automatic generation(Tx) and response(Rx) to
- Ethernet PAUSE frames.
+-----------
+Valid Range: 0-3 (0=none, 1=Rx only, 2=Tx only, 3=Rx&Tx)
+Default Value: Reads flow control settings from the EEPROM
+
+This parameter controls the automatic generation(Tx) and response(Rx)
+to Ethernet PAUSE frames.
+
InterruptThrottleRate
-Valid Range: 100-100000 (0=off, 1=dynamic)
-Default Value: 8000
- This value represents the maximum number of interrupts per second the
- controller generates. InterruptThrottleRate is another setting used in
- interrupt moderation. Dynamic mode uses a heuristic algorithm to adjust
- InterruptThrottleRate based on the current traffic load.
-Un-supported Adapters: InterruptThrottleRate is NOT supported by 82542, 82543
- or 82544-based adapters.
-
- NOTE: InterruptThrottleRate takes precedence over the TxAbsIntDelay and
- RxAbsIntDelay parameters. In other words, minimizing the receive
- and/or transmit absolute delays does not force the controller to
- generate more interrupts than what the Interrupt Throttle Rate
- allows.
- CAUTION: If you are using the Intel PRO/1000 CT Network Connection
- (controller 82547), setting InterruptThrottleRate to a value
- greater than 75,000, may hang (stop transmitting) adapters under
- certain network conditions. If this occurs a NETDEV WATCHDOG
- message is logged in the system event log. In addition, the
- controller is automatically reset, restoring the network
- connection. To eliminate the potential for the hang, ensure
- that InterruptThrottleRate is set no greater than 75,000 and is
- not set to 0.
- NOTE: When e1000 is loaded with default settings and multiple adapters are
- in use simultaneously, the CPU utilization may increase non-linearly.
- In order to limit the CPU utilization without impacting the overall
- throughput, we recommend that you load the driver as follows:
-
- insmod e1000.o InterruptThrottleRate=3000,3000,3000
-
- This sets the InterruptThrottleRate to 3000 interrupts/sec for the
- first, second, and third instances of the driver. The range of 2000 to
- 3000 interrupts per second works on a majority of systems and is a
- good starting point, but the optimal value will be platform-specific.
- If CPU utilization is not a concern, use RX_POLLING (NAPI) and default
- driver settings.
+---------------------
+(not supported on Intel(R) 82542, 82543 or 82544-based adapters)
+Valid Range: 0,1,3,100-100000 (0=off, 1=dynamic, 3=dynamic conservative)
+Default Value: 3
+
+The driver can limit the amount of interrupts per second that the adapter
+will generate for incoming packets. It does this by writing a value to the
+adapter that is based on the maximum amount of interrupts that the adapter
+will generate per second.
+
+Setting InterruptThrottleRate to a value greater or equal to 100
+will program the adapter to send out a maximum of that many interrupts
+per second, even if more packets have come in. This reduces interrupt
+load on the system and can lower CPU utilization under heavy load,
+but will increase latency as packets are not processed as quickly.
+
+The default behaviour of the driver previously assumed a static
+InterruptThrottleRate value of 8000, providing a good fallback value for
+all traffic types,but lacking in small packet performance and latency.
+The hardware can handle many more small packets per second however, and
+for this reason an adaptive interrupt moderation algorithm was implemented.
+
+Since 7.3.x, the driver has two adaptive modes (setting 1 or 3) in which
+it dynamically adjusts the InterruptThrottleRate value based on the traffic
+that it receives. After determining the type of incoming traffic in the last
+timeframe, it will adjust the InterruptThrottleRate to an appropriate value
+for that traffic.
+
+The algorithm classifies the incoming traffic every interval into
+classes. Once the class is determined, the InterruptThrottleRate value is
+adjusted to suit that traffic type the best. There are three classes defined:
+"Bulk traffic", for large amounts of packets of normal size; "Low latency",
+for small amounts of traffic and/or a significant percentage of small
+packets; and "Lowest latency", for almost completely small packets or
+minimal traffic.
+
+In dynamic conservative mode, the InterruptThrottleRate value is set to 4000
+for traffic that falls in class "Bulk traffic". If traffic falls in the "Low
+latency" or "Lowest latency" class, the InterruptThrottleRate is increased
+stepwise to 20000. This default mode is suitable for most applications.
+
+For situations where low latency is vital such as cluster or
+grid computing, the algorithm can reduce latency even more when
+InterruptThrottleRate is set to mode 1. In this mode, which operates
+the same as mode 3, the InterruptThrottleRate will be increased stepwise to
+70000 for traffic in class "Lowest latency".
+
+Setting InterruptThrottleRate to 0 turns off any interrupt moderation
+and may improve small packet latency, but is generally not suitable
+for bulk throughput traffic.
+
+NOTE: InterruptThrottleRate takes precedence over the TxAbsIntDelay and
+ RxAbsIntDelay parameters. In other words, minimizing the receive
+ and/or transmit absolute delays does not force the controller to
+ generate more interrupts than what the Interrupt Throttle Rate
+ allows.
+
+CAUTION: If you are using the Intel(R) PRO/1000 CT Network Connection
+ (controller 82547), setting InterruptThrottleRate to a value
+ greater than 75,000, may hang (stop transmitting) adapters
+ under certain network conditions. If this occurs a NETDEV
+ WATCHDOG message is logged in the system event log. In
+ addition, the controller is automatically reset, restoring
+ the network connection. To eliminate the potential for the
+ hang, ensure that InterruptThrottleRate is set no greater
+ than 75,000 and is not set to 0.
+
+NOTE: When e1000 is loaded with default settings and multiple adapters
+ are in use simultaneously, the CPU utilization may increase non-
+ linearly. In order to limit the CPU utilization without impacting
+ the overall throughput, we recommend that you load the driver as
+ follows:
+
+ modprobe e1000 InterruptThrottleRate=3000,3000,3000
+
+ This sets the InterruptThrottleRate to 3000 interrupts/sec for
+ the first, second, and third instances of the driver. The range
+ of 2000 to 3000 interrupts per second works on a majority of
+ systems and is a good starting point, but the optimal value will
+ be platform-specific. If CPU utilization is not a concern, use
+ RX_POLLING (NAPI) and default driver settings.
+
+
RxDescriptors
-Valid Range: 80-256 for 82542 and 82543-based adapters
- 80-4096 for all other supported adapters
+-------------
+Valid Range: 80-256 for 82542 and 82543-based adapters
+ 80-4096 for all other supported adapters
Default Value: 256
- This value is the number of receive descriptors allocated by the driver.
- Increasing this value allows the driver to buffer more incoming packets.
- Each descriptor is 16 bytes. A receive buffer is allocated for each
- descriptor and can either be 2048 or 4096 bytes long, depending on the MTU
- setting. An incoming packet can span one or more receive descriptors.
- The maximum MTU size is 16110.
+This value specifies the number of receive buffer descriptors allocated
+by the driver. Increasing this value allows the driver to buffer more
+incoming packets, at the expense of increased system memory utilization.
+
+Each descriptor is 16 bytes. A receive buffer is also allocated for each
+descriptor and can be either 2048, 4096, 8192, or 16384 bytes, depending
+on the MTU setting. The maximum MTU size is 16110.
+
+NOTE: MTU designates the frame size. It only needs to be set for Jumbo
+ Frames. Depending on the available system resources, the request
+ for a higher number of receive descriptors may be denied. In this
+ case, use a lower number.
- NOTE: MTU designates the frame size. It only needs to be set for Jumbo
- Frames.
- NOTE: Depending on the available system resources, the request for a
- higher number of receive descriptors may be denied. In this case,
- use a lower number.
RxIntDelay
-Valid Range: 0-65535 (0=off)
+----------
+Valid Range: 0-65535 (0=off)
Default Value: 0
- This value delays the generation of receive interrupts in units of 1.024
- microseconds. Receive interrupt reduction can improve CPU efficiency if
- properly tuned for specific network traffic. Increasing this value adds
- extra latency to frame reception and can end up decreasing the throughput
- of TCP traffic. If the system is reporting dropped receives, this value
- may be set too high, causing the driver to run out of available receive
- descriptors.
-
- CAUTION: When setting RxIntDelay to a value other than 0, adapters may
- hang (stop transmitting) under certain network conditions. If
- this occurs a NETDEV WATCHDOG message is logged in the system
- event log. In addition, the controller is automatically reset,
- restoring the network connection. To eliminate the potential for
- the hang ensure that RxIntDelay is set to 0.
-
-RxAbsIntDelay (82540, 82545 and later adapters only)
-Valid Range: 0-65535 (0=off)
+
+This value delays the generation of receive interrupts in units of 1.024
+microseconds. Receive interrupt reduction can improve CPU efficiency if
+properly tuned for specific network traffic. Increasing this value adds
+extra latency to frame reception and can end up decreasing the throughput
+of TCP traffic. If the system is reporting dropped receives, this value
+may be set too high, causing the driver to run out of available receive
+descriptors.
+
+CAUTION: When setting RxIntDelay to a value other than 0, adapters may
+ hang (stop transmitting) under certain network conditions. If
+ this occurs a NETDEV WATCHDOG message is logged in the system
+ event log. In addition, the controller is automatically reset,
+ restoring the network connection. To eliminate the potential
+ for the hang ensure that RxIntDelay is set to 0.
+
+
+RxAbsIntDelay
+-------------
+(This parameter is supported only on 82540, 82545 and later adapters.)
+Valid Range: 0-65535 (0=off)
Default Value: 128
- This value, in units of 1.024 microseconds, limits the delay in which a
- receive interrupt is generated. Useful only if RxIntDelay is non-zero,
- this value ensures that an interrupt is generated after the initial
- packet is received within the set amount of time. Proper tuning,
- along with RxIntDelay, may improve traffic throughput in specific network
- conditions.
-
-Speed (adapters using copper connections only)
+
+This value, in units of 1.024 microseconds, limits the delay in which a
+receive interrupt is generated. Useful only if RxIntDelay is non-zero,
+this value ensures that an interrupt is generated after the initial
+packet is received within the set amount of time. Proper tuning,
+along with RxIntDelay, may improve traffic throughput in specific network
+conditions.
+
+
+Speed
+-----
+(This parameter is supported only on adapters with copper connections.)
Valid Settings: 0, 10, 100, 1000
-Default Value: 0 (auto-negotiate at all supported speeds)
- Speed forces the line speed to the specified value in megabits per second
- (Mbps). If this parameter is not specified or is set to 0 and the link
- partner is set to auto-negotiate, the board will auto-detect the correct
- speed. Duplex should also be set when Speed is set to either 10 or 100.
+Default Value: 0 (auto-negotiate at all supported speeds)
+
+Speed forces the line speed to the specified value in megabits per second
+(Mbps). If this parameter is not specified or is set to 0 and the link
+partner is set to auto-negotiate, the board will auto-detect the correct
+speed. Duplex should also be set when Speed is set to either 10 or 100.
+
TxDescriptors
-Valid Range: 80-256 for 82542 and 82543-based adapters
- 80-4096 for all other supported adapters
+-------------
+Valid Range: 80-256 for 82542 and 82543-based adapters
+ 80-4096 for all other supported adapters
Default Value: 256
- This value is the number of transmit descriptors allocated by the driver.
- Increasing this value allows the driver to queue more transmits. Each
- descriptor is 16 bytes.
- NOTE: Depending on the available system resources, the request for a
- higher number of transmit descriptors may be denied. In this case,
- use a lower number.
+This value is the number of transmit descriptors allocated by the driver.
+Increasing this value allows the driver to queue more transmits. Each
+descriptor is 16 bytes.
+
+NOTE: Depending on the available system resources, the request for a
+ higher number of transmit descriptors may be denied. In this case,
+ use a lower number.
+
TxIntDelay
-Valid Range: 0-65535 (0=off)
+----------
+Valid Range: 0-65535 (0=off)
Default Value: 64
- This value delays the generation of transmit interrupts in units of
- 1.024 microseconds. Transmit interrupt reduction can improve CPU
- efficiency if properly tuned for specific network traffic. If the
- system is reporting dropped transmits, this value may be set too high
- causing the driver to run out of available transmit descriptors.
-
-TxAbsIntDelay (82540, 82545 and later adapters only)
-Valid Range: 0-65535 (0=off)
+
+This value delays the generation of transmit interrupts in units of
+1.024 microseconds. Transmit interrupt reduction can improve CPU
+efficiency if properly tuned for specific network traffic. If the
+system is reporting dropped transmits, this value may be set too high
+causing the driver to run out of available transmit descriptors.
+
+
+TxAbsIntDelay
+-------------
+(This parameter is supported only on 82540, 82545 and later adapters.)
+Valid Range: 0-65535 (0=off)
Default Value: 64
- This value, in units of 1.024 microseconds, limits the delay in which a
- transmit interrupt is generated. Useful only if TxIntDelay is non-zero,
- this value ensures that an interrupt is generated after the initial
- packet is sent on the wire within the set amount of time. Proper tuning,
- along with TxIntDelay, may improve traffic throughput in specific
- network conditions.
-
-XsumRX (not available on the 82542-based adapter)
-Valid Range: 0-1
+
+This value, in units of 1.024 microseconds, limits the delay in which a
+transmit interrupt is generated. Useful only if TxIntDelay is non-zero,
+this value ensures that an interrupt is generated after the initial
+packet is sent on the wire within the set amount of time. Proper tuning,
+along with TxIntDelay, may improve traffic throughput in specific
+network conditions.
+
+XsumRX
+------
+(This parameter is NOT supported on the 82542-based adapter.)
+Valid Range: 0-1
Default Value: 1
- A value of '1' indicates that the driver should enable IP checksum
- offload for received packets (both UDP and TCP) to the adapter hardware.
+
+A value of '1' indicates that the driver should enable IP checksum
+offload for received packets (both UDP and TCP) to the adapter hardware.
+
Speed and Duplex Configuration
==============================
-Three keywords are used to control the speed and duplex configuration. These
-keywords are Speed, Duplex, and AutoNeg.
+Three keywords are used to control the speed and duplex configuration.
+These keywords are Speed, Duplex, and AutoNeg.
-If the board uses a fiber interface, these keywords are ignored, and the
+If the board uses a fiber interface, these keywords are ignored, and the
fiber interface board only links at 1000 Mbps full-duplex.
For copper-based boards, the keywords interact as follows:
- The default operation is auto-negotiate. The board advertises all supported
- speed and duplex combinations, and it links at the highest common speed and
- duplex mode IF the link partner is set to auto-negotiate.
+ The default operation is auto-negotiate. The board advertises all
+ supported speed and duplex combinations, and it links at the highest
+ common speed and duplex mode IF the link partner is set to auto-negotiate.
+
+ If Speed = 1000, limited auto-negotiation is enabled and only 1000 Mbps
+ is advertised (The 1000BaseT spec requires auto-negotiation.)
+
+ If Speed = 10 or 100, then both Speed and Duplex should be set. Auto-
+ negotiation is disabled, and the AutoNeg parameter is ignored. Partner
+ SHOULD also be forced.
+
+The AutoNeg parameter is used when more control is required over the
+auto-negotiation process. It should be used when you wish to control which
+speed and duplex combinations are advertised during the auto-negotiation
+process.
- If Speed = 1000, limited auto-negotiation is enabled and only 1000 Mbps is
- advertised (The 1000BaseT spec requires auto-negotiation.)
+The parameter may be specified as either a decimal or hexadecimal value as
+determined by the bitmap below.
- If Speed = 10 or 100, then both Speed and Duplex should be set. Auto-
- negotiation is disabled, and the AutoNeg parameter is ignored. Partner SHOULD
- also be forced.
+Bit position 7 6 5 4 3 2 1 0
+Decimal Value 128 64 32 16 8 4 2 1
+Hex value 80 40 20 10 8 4 2 1
+Speed (Mbps) N/A N/A 1000 N/A 100 100 10 10
+Duplex Full Full Half Full Half
-The AutoNeg parameter is used when more control is required over the auto-
-negotiation process. When this parameter is used, Speed and Duplex parameters
-must not be specified. The following table describes supported values for the
-AutoNeg parameter:
+Some examples of using AutoNeg:
-Speed (Mbps) 1000 100 100 10 10
-Duplex Full Full Half Full Half
-Value (in base 16) 0x20 0x08 0x04 0x02 0x01
+ modprobe e1000 AutoNeg=0x01 (Restricts autonegotiation to 10 Half)
+ modprobe e1000 AutoNeg=1 (Same as above)
+ modprobe e1000 AutoNeg=0x02 (Restricts autonegotiation to 10 Full)
+ modprobe e1000 AutoNeg=0x03 (Restricts autonegotiation to 10 Half or 10 Full)
+ modprobe e1000 AutoNeg=0x04 (Restricts autonegotiation to 100 Half)
+ modprobe e1000 AutoNeg=0x05 (Restricts autonegotiation to 10 Half or 100
+ Half)
+ modprobe e1000 AutoNeg=0x020 (Restricts autonegotiation to 1000 Full)
+ modprobe e1000 AutoNeg=32 (Same as above)
-Example: insmod e1000 AutoNeg=0x03, loads e1000 and specifies (10 full duplex,
-10 half duplex) for negotiation with the peer.
+Note that when this parameter is used, Speed and Duplex must not be specified.
-Note that setting AutoNeg does not guarantee that the board will link at the
-highest specified speed or duplex mode, but the board will link at the
-highest possible speed/duplex of the link partner IF the link partner is also
-set to auto-negotiate. If the link partner is forced speed/duplex, the
-adapter MUST be forced to the same speed/duplex.
+If the link partner is forced to a specific speed and duplex, then this
+parameter should not be used. Instead, use the Speed and Duplex parameters
+previously mentioned to force the adapter to the same speed and duplex.
Additional Configurations
Configuring the Driver on Different Distributions
-------------------------------------------------
-
- Configuring a network driver to load properly when the system is started is
- distribution dependent. Typically, the configuration process involves adding
- an alias line to /etc/modules.conf as well as editing other system startup
- scripts and/or configuration files. Many popular Linux distributions ship
- with tools to make these changes for you. To learn the proper way to
- configure a network device for your system, refer to your distribution
- documentation. If during this process you are asked for the driver or module
- name, the name for the Linux Base Driver for the Intel PRO/1000 Family of
- Adapters is e1000.
-
- As an example, if you install the e1000 driver for two PRO/1000 adapters
- (eth0 and eth1) and set the speed and duplex to 10full and 100half, add the
- following to modules.conf:
+ Configuring a network driver to load properly when the system is started
+ is distribution dependent. Typically, the configuration process involves
+ adding an alias line to /etc/modules.conf or /etc/modprobe.conf as well
+ as editing other system startup scripts and/or configuration files. Many
+ popular Linux distributions ship with tools to make these changes for you.
+ To learn the proper way to configure a network device for your system,
+ refer to your distribution documentation. If during this process you are
+ asked for the driver or module name, the name for the Linux Base Driver
+ for the Intel(R) PRO/1000 Family of Adapters is e1000.
+
+ As an example, if you install the e1000 driver for two PRO/1000 adapters
+ (eth0 and eth1) and set the speed and duplex to 10full and 100half, add
+ the following to modules.conf or or modprobe.conf:
alias eth0 e1000
alias eth1 e1000
Viewing Link Messages
---------------------
-
- Link messages will not be displayed to the console if the distribution is
- restricting system messages. In order to see network driver link messages on
- your console, set dmesg to eight by entering the following:
+ Link messages will not be displayed to the console if the distribution is
+ restricting system messages. In order to see network driver link messages
+ on your console, set dmesg to eight by entering the following:
dmesg -n 8
Jumbo Frames
------------
-
- The driver supports Jumbo Frames for all adapters except 82542-based
- adapters. Jumbo Frames support is enabled by changing the MTU to a value
- larger than the default of 1500. Use the ifconfig command to increase the
- MTU size. For example:
-
- ifconfig ethx mtu 9000 up
-
- The maximum MTU setting for Jumbo Frames is 16110. This value coincides
- with the maximum Jumbo Frames size of 16128.
-
- NOTE: Jumbo Frames are supported at 1000 Mbps only. Using Jumbo Frames at
- 10 or 100 Mbps may result in poor performance or loss of link.
+ Jumbo Frames support is enabled by changing the MTU to a value larger than
+ the default of 1500. Use the ifconfig command to increase the MTU size.
+ For example:
+
+ ifconfig eth<x> mtu 9000 up
+
+ This setting is not saved across reboots. It can be made permanent if
+ you add:
+
+ MTU=9000
+
+ to the file /etc/sysconfig/network-scripts/ifcfg-eth<x>. This example
+ applies to the Red Hat distributions; other distributions may store this
+ setting in a different location.
+
+ Notes:
+
+ - To enable Jumbo Frames, increase the MTU size on the interface beyond
+ 1500.
+
+ - The maximum MTU setting for Jumbo Frames is 16110. This value coincides
+ with the maximum Jumbo Frames size of 16128.
+
+ - Using Jumbo Frames at 10 or 100 Mbps may result in poor performance or
+ loss of link.
+
+ - Some Intel gigabit adapters that support Jumbo Frames have a frame size
+ limit of 9238 bytes, with a corresponding MTU size limit of 9216 bytes.
+ The adapters with this limitation are based on the Intel(R) 82571EB,
+ 82572EI, 82573L and 80003ES2LAN controller. These correspond to the
+ following product names:
+ Intel(R) PRO/1000 PT Server Adapter
+ Intel(R) PRO/1000 PT Desktop Adapter
+ Intel(R) PRO/1000 PT Network Connection
+ Intel(R) PRO/1000 PT Dual Port Server Adapter
+ Intel(R) PRO/1000 PT Dual Port Network Connection
+ Intel(R) PRO/1000 PF Server Adapter
+ Intel(R) PRO/1000 PF Network Connection
+ Intel(R) PRO/1000 PF Dual Port Server Adapter
+ Intel(R) PRO/1000 PB Server Connection
+ Intel(R) PRO/1000 PL Network Connection
+ Intel(R) PRO/1000 EB Network Connection with I/O Acceleration
+ Intel(R) PRO/1000 EB Backplane Connection with I/O Acceleration
+ Intel(R) PRO/1000 PT Quad Port Server Adapter
+
+ - Adapters based on the Intel(R) 82542 and 82573V/E controller do not
+ support Jumbo Frames. These correspond to the following product names:
+ Intel(R) PRO/1000 Gigabit Server Adapter
+ Intel(R) PRO/1000 PM Network Connection
+
+ - The following adapters do not support Jumbo Frames:
+ Intel(R) 82562V 10/100 Network Connection
+ Intel(R) 82566DM Gigabit Network Connection
+ Intel(R) 82566DC Gigabit Network Connection
+ Intel(R) 82566MM Gigabit Network Connection
+ Intel(R) 82566MC Gigabit Network Connection
+ Intel(R) 82562GT 10/100 Network Connection
+ Intel(R) 82562G 10/100 Network Connection
- NOTE: MTU designates the frame size. To enable Jumbo Frames, increase the
- MTU size on the interface beyond 1500.
-
Ethtool
-------
-
The driver utilizes the ethtool interface for driver configuration and
diagnostics, as well as displaying statistical information. Ethtool
version 1.6 or later is required for this functionality.
The latest release of ethtool can be found from
- http://sf.net/projects/gkernel.
+ http://sourceforge.net/projects/gkernel.
- NOTE: Ethtool 1.6 only supports a limited set of ethtool options. Support
- for a more complete ethtool feature set can be enabled by upgrading
- ethtool to ethtool-1.8.1.
+ NOTE: Ethtool 1.6 only supports a limited set of ethtool options. Support
+ for a more complete ethtool feature set can be enabled by upgrading
+ ethtool to ethtool-1.8.1.
Enabling Wake on LAN* (WoL)
---------------------------
-
- WoL is configured through the Ethtool* utility. Ethtool is included with
- all versions of Red Hat after Red Hat 7.2. For other Linux distributions,
- download and install Ethtool from the following website:
+ WoL is configured through the Ethtool* utility. Ethtool is included with
+ all versions of Red Hat after Red Hat 7.2. For other Linux distributions,
+ download and install Ethtool from the following website:
http://sourceforge.net/projects/gkernel.
- For instructions on enabling WoL with Ethtool, refer to the website listed
+ For instructions on enabling WoL with Ethtool, refer to the website listed
above.
- WoL will be enabled on the system during the next shut down or reboot.
- For this driver version, in order to enable WoL, the e1000 driver must be
+ WoL will be enabled on the system during the next shut down or reboot.
+ For this driver version, in order to enable WoL, the e1000 driver must be
loaded when shutting down or rebooting the system.
+ Wake On LAN is only supported on port A for the following devices:
+ Intel(R) PRO/1000 PT Dual Port Network Connection
+ Intel(R) PRO/1000 PT Dual Port Server Connection
+ Intel(R) PRO/1000 PT Dual Port Server Adapter
+ Intel(R) PRO/1000 PF Dual Port Server Adapter
+ Intel(R) PRO/1000 PT Quad Port Server Adapter
+
NAPI
----
+ NAPI (Rx polling mode) is supported in the e1000 driver. NAPI is enabled
+ or disabled based on the configuration of the kernel. To override
+ the default, use the following compile-time flags.
+
+ To enable NAPI, compile the driver module, passing in a configuration option:
+
+ make CFLAGS_EXTRA=-DE1000_NAPI install
- NAPI (Rx polling mode) is supported in the e1000 driver. NAPI is enabled
- or disabled based on the configuration of the kernel.
+ To disable NAPI, compile the driver module, passing in a configuration option:
+
+ make CFLAGS_EXTRA=-DE1000_NO_NAPI install
See www.cyberus.ca/~hadi/usenix-paper.tgz for more information on NAPI.
Known Issues
============
- Jumbo Frames System Requirement
- -------------------------------
-
- Memory allocation failures have been observed on Linux systems with 64 MB
- of RAM or less that are running Jumbo Frames. If you are using Jumbo Frames,
- your system may require more than the advertised minimum requirement of 64 MB
- of system memory.
+Dropped Receive Packets on Half-duplex 10/100 Networks
+------------------------------------------------------
+If you have an Intel PCI Express adapter running at 10mbps or 100mbps, half-
+duplex, you may observe occasional dropped receive packets. There are no
+workarounds for this problem in this network configuration. The network must
+be updated to operate in full-duplex, and/or 1000mbps only.
+
+Jumbo Frames System Requirement
+-------------------------------
+Memory allocation failures have been observed on Linux systems with 64 MB
+of RAM or less that are running Jumbo Frames. If you are using Jumbo
+Frames, your system may require more than the advertised minimum
+requirement of 64 MB of system memory.
+
+Performance Degradation with Jumbo Frames
+-----------------------------------------
+Degradation in throughput performance may be observed in some Jumbo frames
+environments. If this is observed, increasing the application's socket
+buffer size and/or increasing the /proc/sys/net/ipv4/tcp_*mem entry values
+may help. See the specific application manual and
+/usr/src/linux*/Documentation/
+networking/ip-sysctl.txt for more details.
+
+Jumbo Frames on Foundry BigIron 8000 switch
+-------------------------------------------
+There is a known issue using Jumbo frames when connected to a Foundry
+BigIron 8000 switch. This is a 3rd party limitation. If you experience
+loss of packets, lower the MTU size.
+
+Allocating Rx Buffers when Using Jumbo Frames
+---------------------------------------------
+Allocating Rx buffers when using Jumbo Frames on 2.6.x kernels may fail if
+the available memory is heavily fragmented. This issue may be seen with PCI-X
+adapters or with packet split disabled. This can be reduced or eliminated
+by changing the amount of available memory for receive buffer allocation, by
+increasing /proc/sys/vm/min_free_kbytes.
+
+Multiple Interfaces on Same Ethernet Broadcast Network
+------------------------------------------------------
+Due to the default ARP behavior on Linux, it is not possible to have
+one system on two IP networks in the same Ethernet broadcast domain
+(non-partitioned switch) behave as expected. All Ethernet interfaces
+will respond to IP traffic for any IP address assigned to the system.
+This results in unbalanced receive traffic.
+
+If you have multiple interfaces in a server, either turn on ARP
+filtering by entering:
+
+ echo 1 > /proc/sys/net/ipv4/conf/all/arp_filter
+(this only works if your kernel's version is higher than 2.4.5),
+
+NOTE: This setting is not saved across reboots. The configuration
+change can be made permanent by adding the line:
+ net.ipv4.conf.all.arp_filter = 1
+to the file /etc/sysctl.conf
+
+ or,
+
+install the interfaces in separate broadcast domains (either in
+different switches or in a switch partitioned to VLANs).
+
+82541/82547 can't link or are slow to link with some link partners
+-----------------------------------------------------------------
+There is a known compatibility issue with 82541/82547 and some
+low-end switches where the link will not be established, or will
+be slow to establish. In particular, these switches are known to
+be incompatible with 82541/82547:
+
+ Planex FXG-08TE
+ I-O Data ETG-SH8
+
+To workaround this issue, the driver can be compiled with an override
+of the PHY's master/slave setting. Forcing master or forcing slave
+mode will improve time-to-link.
+
+ # make CFLAGS_EXTRA=-DE1000_MASTER_SLAVE=<n>
+
+Where <n> is:
+
+ 0 = Hardware default
+ 1 = Master mode
+ 2 = Slave mode
+ 3 = Auto master/slave
+
+Disable rx flow control with ethtool
+------------------------------------
+In order to disable receive flow control using ethtool, you must turn
+off auto-negotiation on the same command line.
+
+For example:
+
+ ethtool -A eth? autoneg off rx off
+
+Unplugging network cable while ethtool -p is running
+----------------------------------------------------
+In kernel versions 2.5.50 and later (including 2.6 kernel), unplugging
+the network cable while ethtool -p is running will cause the system to
+become unresponsive to keyboard commands, except for control-alt-delete.
+Restarting the system appears to be the only remedy.
Support
http://support.intel.com
-If an issue is identified with the released source code on the supported
-kernel with a supported adapter, email the specific information related to
-the issue to linux.nics@intel.com.
+or the Intel Wired Networking project hosted by Sourceforge at:
+ http://sourceforge.net/projects/e1000
-License
-=======
-
-This software program is released under the terms of a license agreement
-between you ('Licensee') and Intel. Do not use or load this software or any
-associated materials (collectively, the 'Software') until you have carefully
-read the full terms and conditions of the LICENSE located in this software
-package. By loading or using the Software, you agree to the terms of this
-Agreement. If you do not agree with the terms of this Agreement, do not
-install or use the Software.
-
-* Other names and brands may be claimed as the property of others.
+If an issue is identified with the released source code on the supported
+kernel with a supported adapter, email the specific information related
+to the issue to e1000-devel@lists.sf.net
git://git.onelab.eu / linux-2.6.git / blobdiff