| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.9 094/104] tcp: fix under-evaluated ssthresh in TCP Vegas | Date | Fri, 22 Dec 2017 09:47:00 +0100 |
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4.9-stable review patch. If anyone has any objections, please let me know.
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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)
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