Patch "tcp: fix under-evaluated ssthresh in TCP Vegas" has been added to the 4.4-stable tree

Patch "tcp: fix under-evaluated ssthresh in TCP Vegas" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    tcp: fix under-evaluated ssthresh in TCP Vegas

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     tcp-fix-under-evaluated-ssthresh-in-tcp-vegas.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From foo@baz Thu Dec 21 10:35:49 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)


Patches currently in stable-queue which might be from tranviethoang.vn@gmail.com are

queue-4.4/tcp-fix-under-evaluated-ssthresh-in-tcp-vegas.patch