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authorVlad Yasevich <vladislav.yasevich@hp.com>2009-09-04 18:20:59 -0400
committerVlad Yasevich <vladislav.yasevich@hp.com>2009-09-04 18:20:59 -0400
commitcb95ea32a457871f72752164de8d94fa20f4703c (patch)
tree0a419cdc3fe5e7e2d5fa5036a40d93a4bb6aac42
parentb29e7907288554db9c987c36facfd0304ee8ff5a (diff)
sctp: Don't do NAGLE delay on large writes that were fragmented small
SCTP will delay the last part of a large write due to NAGLE, if that part is smaller then MTU. Since we are doing large writes, we might as well send the last portion now instead of waiting untill the next large write happens. The small portion will be sent as is regardless, so it's better to not delay it. This is a result of much discussions with Wei Yongjun <yjwei@cn.fujitsu.com> and Doug Graham <dgraham@nortel.com>. Many thanks go out to them. Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
-rw-r--r--include/net/sctp/structs.h2
-rw-r--r--net/sctp/chunk.c2
-rw-r--r--net/sctp/output.c4
3 files changed, 6 insertions, 2 deletions
diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index b1bd2689bb7..df4c6321996 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -628,7 +628,7 @@ struct sctp_datamsg {
/* Chunks waiting to be submitted to lower layer. */
struct list_head chunks;
/* Chunks that have been transmitted. */
- struct list_head track;
+ size_t msg_size;
/* Reference counting. */
atomic_t refcnt;
/* When is this message no longer interesting to the peer? */
diff --git a/net/sctp/chunk.c b/net/sctp/chunk.c
index 645577ddc33..acf7c4d128f 100644
--- a/net/sctp/chunk.c
+++ b/net/sctp/chunk.c
@@ -59,6 +59,7 @@ static void sctp_datamsg_init(struct sctp_datamsg *msg)
msg->can_abandon = 0;
msg->expires_at = 0;
INIT_LIST_HEAD(&msg->chunks);
+ msg->msg_size = 0;
}
/* Allocate and initialize datamsg. */
@@ -155,6 +156,7 @@ static void sctp_datamsg_assign(struct sctp_datamsg *msg, struct sctp_chunk *chu
{
sctp_datamsg_hold(msg);
chunk->msg = msg;
+ msg->msg_size += chunk->skb->len;
}
diff --git a/net/sctp/output.c b/net/sctp/output.c
index d0b84f6eba4..b801bc9fb63 100644
--- a/net/sctp/output.c
+++ b/net/sctp/output.c
@@ -703,8 +703,10 @@ static sctp_xmit_t sctp_packet_can_append_data(struct sctp_packet *packet,
/* Check whether this chunk and all the rest of pending
* data will fit or delay in hopes of bundling a full
* sized packet.
+ * Don't delay large message writes that may have been
+ * fragmeneted into small peices.
*/
- if (len < max) {
+ if ((len < max) && (chunk->msg->msg_size < max)) {
retval = SCTP_XMIT_NAGLE_DELAY;
goto finish;
}