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| author | David Marchand <david.marchand@redhat.com> | 2021-07-16 18:21:16 +0200 |
|---|---|---|
| committer | Ian Stokes <ian.stokes@intel.com> | 2021-07-16 17:43:42 +0100 |
| commit | 3222a89d9aa2bc3ef317611d0a252f372a690d4a (patch) | |
| tree | b7241f7d8eceae4074f55d37533547fa0e41dd9a /Documentation/topics | |
| parent | 30bfba0249393728d22b81ef148e0efe32bd2a8f (diff) | |
| download | openvswitch-3222a89d9aa2bc3ef317611d0a252f372a690d4a.tar.gz | |
dpif-netdev: Report overhead busy cycles per pmd.
Users complained that per rxq pmd usage was confusing: summing those
values per pmd would never reach 100% even if increasing traffic load
beyond pmd capacity.
This is because the dpif-netdev/pmd-rxq-show command only reports "pure"
rxq cycles while some cycles are used in the pmd mainloop and adds up to
the total pmd load.
dpif-netdev/pmd-stats-show does report per pmd load usage.
This load is measured since the last dpif-netdev/pmd-stats-clear call.
On the other hand, the per rxq pmd usage reflects the pmd load on a 10s
sliding window which makes it non trivial to correlate.
Gather per pmd busy cycles with the same periodicity and report the
difference as overhead in dpif-netdev/pmd-rxq-show so that we have all
info in a single command.
Example:
$ ovs-appctl dpif-netdev/pmd-rxq-show
pmd thread numa_id 1 core_id 3:
isolated : true
port: dpdk0 queue-id: 0 (enabled) pmd usage: 90 %
overhead: 4 %
pmd thread numa_id 1 core_id 5:
isolated : false
port: vhost0 queue-id: 0 (enabled) pmd usage: 0 %
port: vhost1 queue-id: 0 (enabled) pmd usage: 93 %
port: vhost2 queue-id: 0 (enabled) pmd usage: 0 %
port: vhost6 queue-id: 0 (enabled) pmd usage: 0 %
overhead: 6 %
pmd thread numa_id 1 core_id 31:
isolated : true
port: dpdk1 queue-id: 0 (enabled) pmd usage: 86 %
overhead: 4 %
pmd thread numa_id 1 core_id 33:
isolated : false
port: vhost3 queue-id: 0 (enabled) pmd usage: 0 %
port: vhost4 queue-id: 0 (enabled) pmd usage: 0 %
port: vhost5 queue-id: 0 (enabled) pmd usage: 92 %
port: vhost7 queue-id: 0 (enabled) pmd usage: 0 %
overhead: 7 %
Signed-off-by: David Marchand <david.marchand@redhat.com>
Acked-by: Kevin Traynor <ktraynor@redhat.com>
Signed-off-by: Ian Stokes <ian.stokes@intel.com>
Diffstat (limited to 'Documentation/topics')
| -rw-r--r-- | Documentation/topics/dpdk/pmd.rst | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/topics/dpdk/pmd.rst b/Documentation/topics/dpdk/pmd.rst index 30040d703..95fa7af12 100644 --- a/Documentation/topics/dpdk/pmd.rst +++ b/Documentation/topics/dpdk/pmd.rst @@ -195,6 +195,11 @@ queue:: due to traffic pattern or reconfig changes, will take one minute to be fully reflected in the stats. +.. versionchanged:: 2.16.0 + + A ``overhead`` statistics is shown per PMD: it represents the number of + cycles inherently consumed by the OVS PMD processing loop. + Rx queue to PMD assignment takes place whenever there are configuration changes or can be triggered by using:: |