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SubjectRe: [PATCH v5 4/4] ipv4: Namespaceify tcp_fastopen_blackhole_timeout knob
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From: Haishuang Yan <yanhaishuang@cmss.chinamobile.com>
Date: Wed, 27 Sep 2017 11:35:43 +0800

> Different namespace application might require different time period in
> second to disable Fastopen on active TCP sockets.
>
> Tested:
> Simulate following similar situation that the server's data gets dropped
> after 3WHS.
> C ---- syn-data ---> S
> C <--- syn/ack ----- S
> C ---- ack --------> S
> S (accept & write)
> C? X <- data ------ S
> [retry and timeout]
>
> And then print netstat of TCPFastOpenBlackhole, the counter increased as
> expected when the firewall blackhole issue is detected and active TFO is
> disabled.
> # cat /proc/net/netstat | awk '{print $91}'
> TCPFastOpenBlackhole
> 1
>
> Signed-off-by: Haishuang Yan <yanhaishuang@cmss.chinamobile.com>

Applied.

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