I should be able to, but won't be able to run the test until Tuesday April 22...
________________________________________
From: Vlad Yasevich [vyasevich@xxxxxxxxx]
Sent: Thursday, April 17, 2014 11:26 AM
To: Butler, Peter; Daniel Borkmann
Cc: linux-sctp@xxxxxxxxxxxxxxx
Subject: Re: Is SCTP throughput really this low compared to TCP?
On 04/14/2014 12:47 PM, Butler, Peter wrote:
> Glad to be of help :o)
>
Hi Peter
Would you be able to run this test again with the following patch
on top of the problematic code.
Thanks
-vlad
commit c9888a220916284403c5115d6c6c7e33a00d0b55
Author: Vlad Yasevich <vyasevic@xxxxxxxxxx>
Date: Thu Apr 17 09:21:52 2014 -0400
sctp: Trigger window update SACK after skb has been freed.
Signed-off-by: Vlad Yasevich <vyasevic@xxxxxxxxxx>
diff --git a/net/sctp/ulpevent.c b/net/sctp/ulpevent.c
index 8d198ae..b59a7c5 100644
--- a/net/sctp/ulpevent.c
+++ b/net/sctp/ulpevent.c
@@ -1011,7 +1011,6 @@ static void sctp_ulpevent_release_data(struct
sctp_ulpevent *event)
{
struct sk_buff *skb, *frag;
unsigned int len;
- struct sctp_association *asoc;
/* Current stack structures assume that the rcv buffer is
* per socket. For UDP style sockets this is not true as
@@ -1036,11 +1035,7 @@ static void sctp_ulpevent_release_data(struct
sctp_ulpevent *event)
}
done:
- asoc = event->asoc;
- sctp_association_hold(asoc);
sctp_ulpevent_release_owner(event);
- sctp_assoc_rwnd_update(asoc, true);
- sctp_association_put(asoc);
}
static void sctp_ulpevent_release_frag_data(struct sctp_ulpevent *event)
@@ -1071,12 +1066,21 @@ done:
*/
void sctp_ulpevent_free(struct sctp_ulpevent *event)
{
+ struct sctp_association *asoc = event->asoc;
+
if (sctp_ulpevent_is_notification(event))
sctp_ulpevent_release_owner(event);
else
sctp_ulpevent_release_data(event);
kfree_skb(sctp_event2skb(event));
+ /* The socket is locked and the assocaiton can't go anywhere
+ * since we are walking the uplqueue. No need to hold
+ * another ref on the association. Now that the skb has been
+ * freed and accounted for everywhere, see if we need to send
+ * a window update SACK.
+ */
+ sctp_assoc_rwnd_update(asoc, true);
}
/* Purge the skb lists holding ulpevents. */
--
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