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| author | Jan Scheurich <jan.scheurich@ericsson.com> | 2018-04-19 19:40:45 +0200 |
|---|---|---|
| committer | Ian Stokes <ian.stokes@intel.com> | 2018-05-11 08:08:24 +0100 |
| commit | 79f368756ce8b9149f5532d44ef1673f20750826 (patch) | |
| tree | 5c47c97db09b918e5bb093e15fc4c44c8c99b1f5 /manpages.mk | |
| parent | 8492adc270fd9b1774683064764cdf56df995b99 (diff) | |
| download | openvswitch-79f368756ce8b9149f5532d44ef1673f20750826.tar.gz | |
dpif-netdev: Detailed performance stats for PMDs
This patch instruments the dpif-netdev datapath to record detailed
statistics of what is happening in every iteration of a PMD thread.
The collection of detailed statistics can be controlled by a new
Open_vSwitch configuration parameter "other_config:pmd-perf-metrics".
By default it is disabled. The run-time overhead, when enabled, is
in the order of 1%.
The covered metrics per iteration are:
- cycles
- packets
- (rx) batches
- packets/batch
- max. vhostuser qlen
- upcalls
- cycles spent in upcalls
This raw recorded data is used threefold:
1. In histograms for each of the following metrics:
- cycles/iteration (log.)
- packets/iteration (log.)
- cycles/packet
- packets/batch
- max. vhostuser qlen (log.)
- upcalls
- cycles/upcall (log)
The histograms bins are divided linear or logarithmic.
2. A cyclic history of the above statistics for 999 iterations
3. A cyclic history of the cummulative/average values per millisecond
wall clock for the last 1000 milliseconds:
- number of iterations
- avg. cycles/iteration
- packets (Kpps)
- avg. packets/batch
- avg. max vhost qlen
- upcalls
- avg. cycles/upcall
The gathered performance metrics can be printed at any time with the
new CLI command
ovs-appctl dpif-netdev/pmd-perf-show [-nh] [-it iter_len] [-ms ms_len]
[-pmd core] [dp]
The options are
-nh: Suppress the histograms
-it iter_len: Display the last iter_len iteration stats
-ms ms_len: Display the last ms_len millisecond stats
-pmd core: Display only the specified PMD
The performance statistics are reset with the existing
dpif-netdev/pmd-stats-clear command.
The output always contains the following global PMD statistics,
similar to the pmd-stats-show command:
Time: 15:24:55.270
Measurement duration: 1.008 s
pmd thread numa_id 0 core_id 1:
Cycles: 2419034712 (2.40 GHz)
Iterations: 572817 (1.76 us/it)
- idle: 486808 (15.9 % cycles)
- busy: 86009 (84.1 % cycles)
Rx packets: 2399607 (2381 Kpps, 848 cycles/pkt)
Datapath passes: 3599415 (1.50 passes/pkt)
- EMC hits: 336472 ( 9.3 %)
- Megaflow hits: 3262943 (90.7 %, 1.00 subtbl lookups/hit)
- Upcalls: 0 ( 0.0 %, 0.0 us/upcall)
- Lost upcalls: 0 ( 0.0 %)
Tx packets: 2399607 (2381 Kpps)
Tx batches: 171400 (14.00 pkts/batch)
Signed-off-by: Jan Scheurich <jan.scheurich@ericsson.com>
Acked-by: Billy O'Mahony <billy.o.mahony@intel.com>
Signed-off-by: Ian Stokes <ian.stokes@intel.com>
Diffstat (limited to 'manpages.mk')
| -rw-r--r-- | manpages.mk | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/manpages.mk b/manpages.mk index f579e5cbd..29fdaa0a1 100644 --- a/manpages.mk +++ b/manpages.mk @@ -252,6 +252,7 @@ vswitchd/ovs-vswitchd.8: \ lib/coverage-unixctl.man \ lib/daemon.man \ lib/dpctl.man \ + lib/dpif-netdev-unixctl.man \ lib/memory-unixctl.man \ lib/netdev-dpdk-unixctl.man \ lib/service.man \ @@ -269,6 +270,7 @@ lib/common.man: lib/coverage-unixctl.man: lib/daemon.man: lib/dpctl.man: +lib/dpif-netdev-unixctl.man: lib/memory-unixctl.man: lib/netdev-dpdk-unixctl.man: lib/service.man: |