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authorSridhar Samudrala <sri@us.ibm.com>2006-09-29 17:09:05 -0700
committerDavid S. Miller <davem@davemloft.net>2006-09-29 17:09:05 -0700
commitcd49788563d3b9e2ec0b316fa57aef1c0cb3bd4b (patch)
treea05455a25c805f5ec775f730ee7cab789948649d /net
parent208edef6a5b6c50363c77efcf34c4b4020681029 (diff)
downloadconfigs-cd49788563d3b9e2ec0b316fa57aef1c0cb3bd4b.tar.gz
[SCTP]: Include sk_buff overhead while updating the peer's receive window.
Currently if the sender is sending small messages, it can cause a receiver to run out of receive buffer space even when the advertised receive window is still open and results in packet drops and retransmissions. Including a overhead while updating the sender's view of peer receive window will reduce the chances of receive buffer space overshooting the receive window. Signed-off-by: Sridhar Samudrala <sri@us.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net')
-rw-r--r--net/sctp/output.c10
-rw-r--r--net/sctp/outqueue.c3
2 files changed, 10 insertions, 3 deletions
diff --git a/net/sctp/output.c b/net/sctp/output.c
index cdc5a393676..3ef4351dd95 100644
--- a/net/sctp/output.c
+++ b/net/sctp/output.c
@@ -633,7 +633,7 @@ static sctp_xmit_t sctp_packet_append_data(struct sctp_packet *packet,
* data will fit or delay in hopes of bundling a full
* sized packet.
*/
- if (len < asoc->pathmtu - packet->overhead) {
+ if (len < asoc->frag_point) {
retval = SCTP_XMIT_NAGLE_DELAY;
goto finish;
}
@@ -645,7 +645,13 @@ static sctp_xmit_t sctp_packet_append_data(struct sctp_packet *packet,
/* Keep track of how many bytes are in flight to the receiver. */
asoc->outqueue.outstanding_bytes += datasize;
- /* Update our view of the receiver's rwnd. */
+ /* Update our view of the receiver's rwnd. Include sk_buff overhead
+ * while updating peer.rwnd so that it reduces the chances of a
+ * receiver running out of receive buffer space even when receive
+ * window is still open. This can happen when a sender is sending
+ * sending small messages.
+ */
+ datasize += sizeof(struct sk_buff);
if (datasize < rwnd)
rwnd -= datasize;
else
diff --git a/net/sctp/outqueue.c b/net/sctp/outqueue.c
index 37074a39ecb..739582415bf 100644
--- a/net/sctp/outqueue.c
+++ b/net/sctp/outqueue.c
@@ -416,7 +416,8 @@ void sctp_retransmit_mark(struct sctp_outq *q,
* (Section 7.2.4)), add the data size of those
* chunks to the rwnd.
*/
- q->asoc->peer.rwnd += sctp_data_size(chunk);
+ q->asoc->peer.rwnd += (sctp_data_size(chunk) +
+ sizeof(struct sk_buff));
q->outstanding_bytes -= sctp_data_size(chunk);
transport->flight_size -= sctp_data_size(chunk);