tcp: fix potential underestimation on rcv_rtt

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[ Upstream commit 9ee11bd03c ]

When ms timestamp is used, current logic uses 1us in
tcp_rcv_rtt_update() when the real rcv_rtt is within 1 - 999us.
This could cause rcv_rtt underestimation.
Fix it by always using a min value of 1ms if ms timestamp is used.

Fixes: 645f4c6f2e ("tcp: switch rcv_rtt_est and rcvq_space to high resolution timestamps")
Signed-off-by: Wei Wang <weiwan@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Acked-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Wei Wang 2017-12-12 16:28:58 -08:00 • committed by Greg Kroah-Hartman

parent bcc029ff5d

commit 583395a81f

1 changed files with 6 additions and 4 deletions

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net/ipv4/tcp_input.c

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