| From foo@baz Thu Dec 21 09:02:40 CET 2017 |
| From: Hoang Tran <tranviethoang.vn@gmail.com> |
| Date: Wed, 27 Sep 2017 18:30:58 +0200 |
| Subject: tcp: fix under-evaluated ssthresh in TCP Vegas |
| |
| From: Hoang Tran <tranviethoang.vn@gmail.com> |
| |
| |
| [ Upstream commit cf5d74b85ef40c202c76d90959db4d850f301b95 ] |
| |
| 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> |
| Signed-off-by: Sasha Levin <alexander.levin@verizon.com> |
| Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| --- |
| net/ipv4/tcp_vegas.c | 2 +- |
| 1 file changed, 1 insertion(+), 1 deletion(-) |
| |
| --- a/net/ipv4/tcp_vegas.c |
| +++ b/net/ipv4/tcp_vegas.c |
| @@ -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) |
