This is a note to let you know that I've just added the patch titled
tcp: use current time in tcp_rcv_space_adjust()
to the 4.14-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-use-current-time-in-tcp_rcv_space_adjust.patch
and it can be found in the queue-4.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Thu Dec 14 11:45:40 CET 2017
From: Eric Dumazet <edumazet@xxxxxxxxxx>
Date: Wed, 6 Dec 2017 11:08:19 -0800
Subject: tcp: use current time in tcp_rcv_space_adjust()
From: Eric Dumazet <edumazet@xxxxxxxxxx>
[ Upstream commit 8632385022f2b05a6ca0b9e0f95575865de0e2ce ]
When I switched rcv_rtt_est to high resolution timestamps, I forgot
that tp->tcp_mstamp needed to be refreshed in tcp_rcv_space_adjust()
Using an old timestamp leads to autotuning lags.
Fixes: 645f4c6f2ebd ("tcp: switch rcv_rtt_est and rcvq_space to high resolution timestamps")
Signed-off-by: Eric Dumazet <edumazet@xxxxxxxxxx>
Cc: Wei Wang <weiwan@xxxxxxxxxx>
Cc: Neal Cardwell <ncardwell@xxxxxxxxxx>
Cc: Yuchung Cheng <ycheng@xxxxxxxxxx>
Acked-by: Neal Cardwell <ncardwell@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
net/ipv4/tcp_input.c | 1 +
1 file changed, 1 insertion(+)
--- a/net/ipv4/tcp_input.c
+++ b/net/ipv4/tcp_input.c
@@ -592,6 +592,7 @@ void tcp_rcv_space_adjust(struct sock *s
int time;
int copied;
+ tcp_mstamp_refresh(tp);
time = tcp_stamp_us_delta(tp->tcp_mstamp, tp->rcvq_space.time);
if (time < (tp->rcv_rtt_est.rtt_us >> 3) || tp->rcv_rtt_est.rtt_us == 0)
return;
Patches currently in stable-queue which might be from edumazet@xxxxxxxxxx are
queue-4.14/tcp-add-tcp_v4_fill_cb-tcp_v4_restore_cb.patch
queue-4.14/net-thunderx-fix-tcp-udp-checksum-offload-for-ipv6-pkts.patch
queue-4.14/tcp-remove-buggy-call-to-tcp_v6_restore_cb.patch
queue-4.14/net-packet-fix-a-race-in-packet_bind-and-packet_notifier.patch
queue-4.14/tcp-use-ipcb-instead-of-tcp_skb_cb-in-inet_exact_dif_match.patch
queue-4.14/net-thunderx-fix-tcp-udp-checksum-offload-for-ipv4-pkts.patch
queue-4.14/packet-fix-crash-in-fanout_demux_rollover.patch
queue-4.14/net-remove-hlist_nulls_add_tail_rcu.patch
queue-4.14/tcp-when-scheduling-tlp-time-of-rto-should-account-for-current-ack.patch
queue-4.14/tcp-dccp-block-bh-before-arming-time_wait-timer.patch
queue-4.14/tcp-use-current-time-in-tcp_rcv_space_adjust.patch