On 2024-05-27 17:35, Jerin Jacob wrote:
On Sat, May 25, 2024 at 1:13 AM Mattias Rönnblom
<mattias.ronnb...@ericsson.com> wrote:
Add the RTE_EVENT_DEV_CAP_IMPLICIT_RELEASE_DISABLE capability to the
DSW event device.
This feature may be used by an EAL thread to pull more work from the
work scheduler, without giving up the option to forward events
originating from a previous dequeue batch. This in turn allows an EAL
thread to be productive while waiting for a hardware accelerator to
complete some operation.
Prior to this change, DSW didn't make any distinction between
RTE_EVENT_OP_FORWARD and RTE_EVENT_OP_NEW type events, other than that
new events would be backpressured earlier.
After this change, DSW tracks the number of released events (i.e.,
events of type RTE_EVENT_OP_FORWARD and RTE_EVENT_OP_RELASE) that has
been enqueued.
For efficency reasons, DSW does not track the *identity* of individual
events. This in turn implies that a certain stage in the flow
migration process, DSW must wait for all pending releases (on the
migration source port, only) to be received from the application, to
assure that no event pertaining to any of the to-be-migrated flows are
being processed.
With this change, DSW starts making a distinction between forward and
new type events for credit allocation purposes. Only RTE_EVENT_OP_NEW
events needs credits. All events marked as RTE_EVENT_OP_FORWARD must
have a corresponding dequeued event from a previous dequeue batch.
Flow migration for flows on RTE_SCHED_TYPE_PARALLEL queues remains
unaffected by this change.
A side-effect of the tweaked DSW migration logic is that the migration
latency is reduced, regardless if implicit relase is enabled or not.
Signed-off-by: Mattias Rönnblom <mattias.ronnb...@ericsson.com>
1) Update releases for PMD specific section for this new feature
Should the release note update be in the same patch, or a separate?
2) Fix CI issue as applicable
https://patches.dpdk.org/project/dpdk/patch/20240524192437.183960-1-mattias.ronnb...@ericsson.com/
http://mails.dpdk.org/archives/test-report/2024-May/672848.html
https://github.com/ovsrobot/dpdk/actions/runs/9229147658
