From d0ce92910bc04e107b2f3f2048f07e94f570035d Mon Sep 17 00:00:00 2001
From: Vlad Yasevich <vladislav.yasevich@hp.com>
Date: Fri, 24 Aug 2007 19:37:46 +0900
Subject: [PATCH] SCTP: Do not retransmit chunks that are newer then rtt.
When performing a retransmit, do not include the chunk if
it was sent less then 1 rtt ago. The reason is that we
may receive the SACK very soon and wouldn't retransmit.
Suggested by Randy Stewart.
Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
---
net/sctp/outqueue.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/net/sctp/outqueue.c b/net/sctp/outqueue.c
index 992f361084b7..28f4fe77ceee 100644
--- a/net/sctp/outqueue.c
+++ b/net/sctp/outqueue.c
@@ -421,6 +421,13 @@ void sctp_retransmit_mark(struct sctp_outq *q,
*/
if ((fast_retransmit && (chunk->fast_retransmit > 0)) ||
(!fast_retransmit && !chunk->tsn_gap_acked)) {
+ /* If this chunk was sent less then 1 rto ago, do not
+ * retransmit this chunk, but give the peer time
+ * to acknowlege it.
+ */
+ if ((jiffies - chunk->sent_at) < transport->rto)
+ continue;
+
/* RFC 2960 6.2.1 Processing a Received SACK
*
* C) Any time a DATA chunk is marked for
--
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