Re: [PATCH net] tcp: fix potential underestimation on rcv_rtt

From: Wei Wang <redacted>
Date: Tue, 12 Dec 2017 16:28:58 -0800

From: Wei Wang <redacted>

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: 645f4c6f2ebd ("tcp: switch rcv_rtt_est and rcvq_space to high
resolution timestamps")

Signed-off-by: Wei Wang <redacted>
Signed-off-by: Eric Dumazet <redacted>

Please, in the future, do not wrap long Fixes: tag lines.  Also, do
not add an empty line between Fixes: and other tags like Signed-off-by.
That are all tags and belong together as a seamless block of text.

Thank you.