diff options
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/topics/dpdk/pmd.rst | 15 |
1 files changed, 6 insertions, 9 deletions
diff --git a/Documentation/topics/dpdk/pmd.rst b/Documentation/topics/dpdk/pmd.rst index 0c3bb717f..e70986d16 100644 --- a/Documentation/topics/dpdk/pmd.rst +++ b/Documentation/topics/dpdk/pmd.rst @@ -334,10 +334,7 @@ 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 a PMD thread:: - $ ovs-vsctl set open_vswitch . other_config:pmd-maxsleep=500 - -Non-zero values will be rounded up to the nearest 10 microseconds to avoid -requesting very small sleep times. + $ 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 @@ -356,12 +353,12 @@ Sleep time statistics for 10 secs can be seen with:: $ ovs-appctl dpif-netdev/pmd-stats-clear \ && sleep 10 && ovs-appctl dpif-netdev/pmd-perf-show -Example output, showing that during the last 10 seconds, 76.8% of iterations -had a sleep of some length. The total amount of sleep time was 9.15 seconds and -the average sleep time per iteration was 46 microseconds:: +Example output, showing that during the last 10 seconds, 74.5% of iterations +had a sleep of some length. The total amount of sleep time was 9.06 seconds +and the average sleep time where a sleep was requested was 9 microseconds:: - - sleep iterations: 153994 ( 76.8 % of iterations) - Sleep time (us): 9159399 ( 59 us/iteration avg.) + - sleep iterations: 977037 ( 74.5 % of iterations) + Sleep time (us): 9068841 ( 9 us/iteration avg.) Any potential power saving from PMD load based sleeping is dependent on the system configuration (e.g. enabling processor C-states) and workloads. |