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[iproute2.git] / tc / README.last

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-Kernel code and interface.
---------------------------
-
-* Compile time switches
-
-There is only one, but very important, compile time switch.
-It is not settable by "make config", but should be selected
-manually and after a bit of thinking in <include/net/pkt_sched.h>
-
-PSCHED_CLOCK_SOURCE can take three values:
-
-       PSCHED_GETTIMEOFDAY
-       PSCHED_JIFFIES
-       PSCHED_CPU
-
-
- PSCHED_GETTIMEOFDAY
-
-Default setting is the most conservative PSCHED_GETTIMEOFDAY.
-It is very slow both because of weird slowness of do_gettimeofday()
-and because it forces code to use unnatural "timeval" format,
-where microseconds and seconds fields are separate.
-Besides that, it will misbehave, when delays exceed 2 seconds
-(f.e. very slow links or classes bounded to small slice of bandwidth)
-To resume: as only you will get it working, select correct clock
-source and forget about PSCHED_GETTIMEOFDAY forever.
-
-
- PSCHED_JIFFIES
-
-Clock is derived from jiffies. On architectures with HZ=100
-granularity of this clock is not enough to make reasonable
-bindings to real time. However, taking into account Linux
-architecture problems, which force us to use artificial
-integrated clock in any case, this switch is not so bad
-for schduling even on high speed networks, though policing
-is not reliable.
-
-
- PSCHED_CPU
-
-It is available only for alpha and pentiums with correct
-CPU timestamp. It is the fastest way, use it when it is available,
-but remember: not all pentiums have this facility, and
-a lot of them have clock, broken by APM etc. etc.
-
-