tcp: fix under-evaluated ssthresh in TCP Vegas
authorHoang Tran <tranviethoang.vn@gmail.com>
Wed, 27 Sep 2017 16:30:58 +0000 (18:30 +0200)
committerDavid S. Miller <davem@davemloft.net>
Fri, 29 Sep 2017 05:07:00 +0000 (06:07 +0100)
With the commit 76174004a0f19785 (tcp: do not slow start when cwnd equals
ssthresh), the comparison to the reduced cwnd in tcp_vegas_ssthresh() would
under-evaluate the ssthresh.

Signed-off-by: Hoang Tran <hoang.tran@uclouvain.be>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/ipv4/tcp_vegas.c

index 218cfcc77650004fea3f4bdfe24760ff0f634acc..ee113ff15fd02febd29371e597b99396aa9cee0b 100644 (file)
@@ -158,7 +158,7 @@ EXPORT_SYMBOL_GPL(tcp_vegas_cwnd_event);
 
 static inline u32 tcp_vegas_ssthresh(struct tcp_sock *tp)
 {
-       return  min(tp->snd_ssthresh, tp->snd_cwnd-1);
+       return  min(tp->snd_ssthresh, tp->snd_cwnd);
 }
 
 static void tcp_vegas_cong_avoid(struct sock *sk, u32 ack, u32 acked)