Author: jfv
Date: Thu Aug 15 21:24:43 2013
New Revision: 254385
URL: http://svnweb.freebsd.org/changeset/base/254385
Log:
MFC r254264 Make the igb_mq_start() routine use TRYLOCK rather than simple
queuing, there were latency and other problems with the latter.
Modified:
stable/9/sys/dev/e1000/if_igb.c
Directory Properties:
stable/9/sys/ (props changed)
stable/9/sys/dev/ (props changed)
stable/9/sys/dev/e1000/ (props changed)
Modified: stable/9/sys/dev/e1000/if_igb.c
==============================================================================
--- stable/9/sys/dev/e1000/if_igb.c Thu Aug 15 21:09:05 2013
(r254384)
+++ stable/9/sys/dev/e1000/if_igb.c Thu Aug 15 21:24:43 2013
(r254385)
@@ -972,7 +972,13 @@ igb_mq_start(struct ifnet *ifp, struct m
que = &adapter->queues[i];
err = drbr_enqueue(ifp, txr->br, m);
- taskqueue_enqueue(que->tq, &txr->txq_task);
+ if (err)
+ return (err);
+ if (IGB_TX_TRYLOCK(txr)) {
+ err = igb_mq_start_locked(ifp, txr);
+ IGB_TX_UNLOCK(txr);
+ } else
+ taskqueue_enqueue(que->tq, &txr->txq_task);
return (err);
}
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