Re: [PATCH net] tcp: make TCP_USER_TIMEOUT accurate for zero window probes
From: Eric Dumazet <edumazet@google.com>
Date: 2021-01-22 20:45:05
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On Fri, Jan 22, 2021 at 8:13 PM Enke Chen [off-list ref] wrote:
From: Enke Chen <redacted>
The TCP_USER_TIMEOUT is checked by the 0-window probe timer. As the
timer has backoff with a max interval of about two minutes, the
actual timeout for TCP_USER_TIMEOUT can be off by up to two minutes.
In this patch the TCP_USER_TIMEOUT is made more accurate by taking it
into account when computing the timer value for the 0-window probes.
This patch is similar to the one that made TCP_USER_TIMEOUT accurate for
RTOs in commit b701a99e431d ("tcp: Add tcp_clamp_rto_to_user_timeout()
helper to improve accuracy").
Signed-off-by: Enke Chen <redacted>
Reviewed-by: Neal Cardwell <ncardwell@google.com>
---SGTM, thanks ! Signed-off-by: Eric Dumazet <edumazet@google.com>