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 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
