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When a packet is sent out a bond port, the bond slave actually used is
-selected based on the packet's source MAC (see choose_output_iface()).
-In particular, the source MAC is hashed into one of 256 values, and
-that value is looked up in a hash table (the "bond hash") kept in the
-"bond_hash" member of struct port. The hash table entry identifies a
-bond slave. If no bond slave has yet been chosen for that hash table
-entry, vswitchd chooses one arbitrarily.
+selected based on the packet's source MAC and VLAN tag (see
+choose_output_iface()). In particular, the source MAC and VLAN tag
+are hashed into one of 256 values, and that value is looked up in a
+hash table (the "bond hash") kept in the "bond_hash" member of struct
+port. The hash table entry identifies a bond slave. If no bond slave
+has yet been chosen for that hash table entry, vswitchd chooses one
+arbitrarily.
Every 10 seconds, vswitchd rebalances the bond slaves (see
bond_rebalance_port()). To rebalance, vswitchd examines the
slaves in order from most-loaded to least-loaded. If highly loaded
slave H is significantly more heavily loaded than the least-loaded
slave L, and slave H carries at least two hashes, then vswitchd shifts
-one of H's hashes to L. However, vswitchd will not shift a hash from
-H to L if that will cause L's load to exceed H's load.
+one of H's hashes to L. However, vswitchd will only shift a hash from
+H to L if it will decrease the ratio of the load between H and L by at
+least 0.1.
Currently, "significantly more loaded" means that H must carry at
least 1 Mbps more traffic, and that traffic must be at least 3%
git://git.onelab.eu / sliver-openvswitch.git / blobdiff