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docs: Clarify changes in Rx queue allocation

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Two mistakes here:

- Automatic assignment of Rx queues to PMD threads has always existed -
  it was simply switched from round-robin allocation to
  utilization-based allocation
- The above, along with the 'pmd-rxq-rebalance' command, was added in
  OVS 2.9.0 - not OVS 2.8.0 - while the 'pmd-rxq-show' command was added
  in OVS 2.6.0 and modified in OVS 2.9.0

Correct both of these and modify the NEWS entry for this to clarify
things a little (it took a bit of git spelunking and bothering people on
IRC to figure out).

Signed-off-by: Stephen Finucane <stephen@that.guru>
Cc: Kevin Traynor <ktraynor@redhat.com>
Cc: Ian Stokes <ian.stokes@intel.com>
Acked-by: Kevin Traynor <ktraynor@redhat.com>
Signed-off-by: Ian Stokes <ian.stokes@intel.com>
This commit is contained in:
Stephen Finucane 2018-04-20 10:24:32 +01:00 committed by Ian Stokes
parent a790e75fa4
commit a1e539885d
2 changed files with 12 additions and 7 deletions
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17
Documentation/topics/dpdk/pmd.rst
View File

@ -148,14 +148,17 @@ or can be triggered by using::
$ ovs-appctl dpif-netdev/pmd-rxq-rebalance
.. versionchanged:: 2.8.0
.. versionchanged:: 2.6.0
Automatic assignment of Rx queues to PMDs and the two related commands,
``pmd-rxq-show`` and ``pmd-rxq-rebalance``, were added in OVS 2.8.0. Prior
to this, behavior was round-robin and processing cycles were not taken into
consideration. Tracking for stats was not available.
The ``pmd-rxq-show`` command was added in OVS 2.6.0.
.. versionchanged:: 2.9.0
The output of ``pmd-rxq-show`` was modified to include utilization as a
percentage.
Utilization-based allocation of Rx queues to PMDs and the
``pmd-rxq-rebalance`` command were added in OVS 2.9.0. Prior to this,
allocation was round-robin and processing cycles were not taken into
consideration.
In addition, the output of ``pmd-rxq-show`` was modified to include
Rx queue utilization of the PMD as a percentage. Prior to this, tracking of
stats was not available.

2
NEWS
View File

@ -83,6 +83,8 @@ v2.9.0 - 19 Feb 2018
"management" statistics.
- ovs-ofctl dump-ports command now prints new of set custom statistics
if available (for OpenFlow 1.4+).
* Switch from round-robin allocation of rxq to pmd assignments to a
utilization-based allocation.
* New appctl command 'dpif-netdev/pmd-rxq-rebalance' to rebalance rxq to
pmd assignments.
* Add rxq utilization of pmd to appctl 'dpif-netdev/pmd-rxq-show'.