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Groups > linux.kernel > #1741731
| From | David Miller <davem@davemloft.net> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH v5 4/4] ipv4: Namespaceify tcp_fastopen_blackhole_timeout knob |
| Date | 2017-09-28 19:50 +0200 |
| Message-ID | <uuL6F-3wn-7@gated-at.bofh.it> (permalink) |
| References | <uubmx-5iR-3@gated-at.bofh.it> <uubmx-5iR-1@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
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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[PATCH v5 4/4] ipv4: Namespaceify tcp_fastopen_blackhole_timeout knob Haishuang Yan <yanhaishuang@cmss.chinamobile.com> - 2017-09-27 05:40 +0200 Re: [PATCH v5 4/4] ipv4: Namespaceify tcp_fastopen_blackhole_timeout knob David Miller <davem@davemloft.net> - 2017-09-28 19:50 +0200
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