commit 085b9f23e255e984b771660eca2aa737f72dbc00
Author: John Heffner <[EMAIL PROTECTED]>
Date: Fri Apr 25 01:43:57 2008 -0700
Increase the max_burst threshold from 3 to tp->reordering.
[ Upstream commit: dd9e0dda66ba38a2ddd1405ac279894260dc5c36 ]
This change is necessary to allow cwnd to grow during persistent
reordering. Cwnd moderation is applied when in the disorder state
and an ack that fills the hole comes in. If the hole was greater
than 3 packets, but less than tp->reordering, cwnd will shrink when
it should not have.
Signed-off-by: John Heffner <[EMAIL PROTECTED]>
Signed-off-by: David S. Miller <[EMAIL PROTECTED]>
Signed-off-by: Greg Kroah-Hartman <[EMAIL PROTECTED]>
diff --git a/include/net/tcp.h b/include/net/tcp.h
index cb5b033..fbc4959 100644
--- a/include/net/tcp.h
+++ b/include/net/tcp.h
@@ -775,11 +775,14 @@ extern void tcp_enter_cwr(struct sock *sk, const int
set_ssthresh);
extern __u32 tcp_init_cwnd(struct tcp_sock *tp, struct dst_entry *dst);
/* Slow start with delack produces 3 packets of burst, so that
- * it is safe "de facto".
+ * it is safe "de facto". This will be the default - same as
+ * the default reordering threshold - but if reordering increases,
+ * we must be able to allow cwnd to burst at least this much in order
+ * to not pull it back when holes are filled.
*/
static __inline__ __u32 tcp_max_burst(const struct tcp_sock *tp)
{
- return 3;
+ return tp->reordering;
}
/* RFC2861 Check whether we are limited by application or congestion window
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