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Unconditional insertion of EMC entries results in EMC thrashing at high numbers of parallel flows. When this occurs, the performance of the EMC often falls below that of the dpcls classifier, rendering the EMC practically useless. Instead of unconditionally inserting entries into the EMC when a miss occurs, use a 1% probability of insertion. This ensures that the most frequent flows have the highest chance of creating an entry in the EMC, and the probability of thrashing the EMC is also greatly reduced. The probability of insertion is configurable, via the other_config:emc-insert-inv-prob option. This value sets the average probability of insertion to 1/emc-insert-inv-prob. For example the following command changes the insertion probability to (on average) 1 in every 20 packets ie. 1/20 ie. 5%. ovs-vsctl set Open_vSwitch . other_config:emc-insert-inv-prob=20 Signed-off-by: Ciara Loftus <ciara.loftus@intel.com> Signed-off-by: Georg Schmuecking <georg.schmuecking@ericsson.com> Co-authored-by: Georg Schmuecking <georg.schmuecking@ericsson.com> Acked-by: Kevin Traynor <ktraynor@redhat.com> Signed-off-by: Daniele Di Proietto <diproiettod@vmware.com>
