In DSW, in case a port can't produce any events for the application to
consume, the port is considered idle.
To slightly reduce wall-time latency, flush the port's output buffer
in case of such an empty dequeue.
Signed-off-by: Mattias Rönnblom <mattias.ronnb...@ericsson.com>
---
drivers/event/dsw/dsw_event.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/drivers/event/dsw/dsw_event.c b/drivers/event/dsw/dsw_event.c
index 296adea18..7f1f29218 100644
--- a/drivers/event/dsw/dsw_event.c
+++ b/drivers/event/dsw/dsw_event.c
@@ -1245,11 +1245,11 @@ dsw_event_dequeue_burst(void *port, struct rte_event
*events, uint16_t num,
* seem to improve performance.
*/
dsw_port_record_seen_events(port, events, dequeued);
- }
- /* XXX: Assuming the port can't produce any more work,
- * consider flushing the output buffer, on dequeued ==
- * 0.
- */
+ } else /* Zero-size dequeue means a likely idle port, and thus
+ * we can afford trading some efficiency for a slightly
+ * reduced event wall-time latency.
+ */
+ dsw_port_flush_out_buffers(dsw, port);
#ifdef DSW_SORT_DEQUEUED
dsw_stable_sort(events, dequeued, sizeof(events[0]), dsw_cmp_event);
--
2.17.1
