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| author | Kevin Traynor <ktraynor@redhat.com> | 2023-01-11 09:35:01 +0000 |
|---|---|---|
| committer | Ilya Maximets <i.maximets@ovn.org> | 2023-01-12 18:56:05 +0100 |
| commit | de3bbdc479a9a78135e1922e4e6011732515e7ef (patch) | |
| tree | 0e637afa610a029ca0b68567361d56108934851b /NEWS | |
| parent | f4c884135139f0d9e309bcd58244191145c5abba (diff) | |
| download | openvswitch-de3bbdc479a9a78135e1922e4e6011732515e7ef.tar.gz | |
dpif-netdev: Add PMD load based sleeping.
Sleep for an incremental amount of time if none of the Rx queues
assigned to a PMD have at least half a batch of packets (i.e. 16 pkts)
on an polling iteration of the PMD.
Upon detecting the threshold of >= 16 pkts on an Rxq, reset the
sleep time to zero (i.e. no sleep).
Sleep time will be increased on each iteration where the low load
conditions remain up to a total of the max sleep time which is set
by the user e.g:
ovs-vsctl set Open_vSwitch . other_config:pmd-maxsleep=500
The default pmd-maxsleep value is 0, which means that no sleeps
will occur and the default behaviour is unchanged from previously.
Also add new stats to pmd-perf-show to get visibility of operation
e.g.
...
- sleep iterations: 153994 ( 76.8 % of iterations)
Sleep time (us): 9159399 ( 59 us/iteration avg.)
...
Reviewed-by: Robin Jarry <rjarry@redhat.com>
Reviewed-by: David Marchand <david.marchand@redhat.com>
Signed-off-by: Kevin Traynor <ktraynor@redhat.com>
Signed-off-by: Ilya Maximets <i.maximets@ovn.org>
Diffstat (limited to 'NEWS')
| -rw-r--r-- | NEWS | 3 |
1 files changed, 3 insertions, 0 deletions
@@ -30,6 +30,9 @@ Post-v3.0.0 - Userspace datapath: * Add '-secs' argument to appctl 'dpif-netdev/pmd-rxq-show' to show the pmd usage of an Rx queue over a configurable time period. + * Add new experimental PMD load based sleeping feature. PMD threads can + request to sleep up to a user configured 'pmd-maxsleep' value under + low load conditions. v3.0.0 - 15 Aug 2022 |