On Wed, Apr 30, 2014 at 01:53:39PM +0200, Christian Stigen Larsen wrote:
> I'm using Open vSwitch with Mininet, and noticed a large increase in ICMP
> ping RTTs when using POX OpenFlow controllers _without_ flow entries:
>
> RTTs were up from an average of 87 ms to 541 ms.
Hmm. I thought about this for a minute longer.
Can you try applying this patch and see if it makes any difference?
diff --git a/ofproto/ofproto-dpif.c b/ofproto/ofproto-dpif.c
index 4cebd77..5eea5ab 100644
--- a/ofproto/ofproto-dpif.c
+++ b/ofproto/ofproto-dpif.c
@@ -1357,6 +1357,12 @@ run(struct ofproto *ofproto_)
ovs_rwlock_unlock(&ofproto->ml->rwlock);
}
+ /* Always updates the ofproto->pins_seqno to avoid frequent wakeup during
+ * flow restore. Even though nothing is processed during flow restore,
+ * all queued 'pins' will be handled immediately when flow restore
+ * completes. */
+ ofproto->pins_seqno = seq_read(ofproto->pins_seq);
+
/* Do not perform any periodic activity required by 'ofproto' while
* waiting for flow restore to complete. */
if (!ofproto_get_flow_restore_wait()) {
@@ -1372,12 +1378,6 @@ run(struct ofproto *ofproto_)
}
}
- /* Always updates the ofproto->pins_seqno to avoid frequent wakeup during
- * flow restore. Even though nothing is processed during flow restore,
- * all queued 'pins' will be handled immediately when flow restore
- * completes. */
- ofproto->pins_seqno = seq_read(ofproto->pins_seq);
-
if (ofproto->netflow) {
netflow_run(ofproto->netflow);
}
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