94032b2d86
PMD threads constantly poll Rx queues which are assigned to them. In order to reduce the CPU cycles they use, they can sleep for small periods of time when there is no load or very-low load on all the Rx queues they poll. This can be enabled by setting the max requested sleep time (in microseconds) for any PMD thread: $ ovs-vsctl set open_vswitch . other_config:pmd-maxsleep=50 With a non-zero max value a PMD may request to sleep by an incrementing amount of time up to the maximum time. If at any point the threshold of at least half a batch of packets (i.e. 16) is received from an Rx queue that the PMD is polling is met, the requested sleep time will be reset to 0. At that point no sleeps will occur until the no/low load conditions return. Sleeping in a PMD thread will mean there is a period of time when the PMD thread will not process packets. Sleep times requested are not guaranteed and can differ significantly depending on system configuration. The actual time not processing packets will be determined by the sleep and processor wake-up times and should be tested with each system configuration. Depends-on: https://review.opendev.org/c/openstack/tripleo-ansible/+/893341 Cc: Christophe Fontaine <cfontain@redhat.com> Change-Id: I4447ed85ba246db1ad46c9715f6e8ee59376b1ea Signed-off-by: Robin Jarry <rjarry@redhat.com> |
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