From: Eric Dumazet <eric.dumazet@gmail.com>
To: Neal Cardwell <ncardwell@google.com>,
Eric Dumazet <eric.dumazet@gmail.com>
Cc: sjpark@amazon.com, Eric Dumazet <edumazet@google.com>,
David Miller <davem@davemloft.net>,
shuah@kernel.org, Netdev <netdev@vger.kernel.org>,
linux-kselftest@vger.kernel.org,
LKML <linux-kernel@vger.kernel.org>,
sj38.park@gmail.com, aams@amazon.com,
SeongJae Park <sjpark@amazon.de>,
Yuchung Cheng <ycheng@google.com>
Subject: Re: [PATCH 2/3] tcp: Reduce SYN resend delay if a suspicous ACK is received
Date: Fri, 31 Jan 2020 14:53:43 -0800 [thread overview]
Message-ID: <7d36a817-5519-8496-17cf-00eda5ed4ec7@gmail.com> (raw)
In-Reply-To: <CADVnQy=Z0YRPY_0bxBpsZvECgamigESNKx6_-meNW5-6_N4kww@mail.gmail.com>
On 1/31/20 2:11 PM, Neal Cardwell wrote:
> I looked into fixing this, but my quick reading of the Linux
> tcp_rcv_state_process() code is that it should behave correctly and
> that a connection in FIN_WAIT_1 that receives a FIN/ACK should move to
> TIME_WAIT.
>
> SeongJae, do you happen to have a tcpdump trace of the problematic
> sequence where the "process A" ends up in FIN_WAIT_2 when it should be
> in TIME_WAIT?
>
> If I have time I will try to construct a packetdrill case to verify
> the behavior in this case.
Unfortunately you wont be able to reproduce the issue with packetdrill,
since it involved packets being processed at the same time (race window)
next prev parent reply other threads:[~2020-01-31 22:53 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-31 12:24 [PATCH 0/3] Fix reconnection latency caused by FIN/ACK handling race sjpark
2020-01-31 12:24 ` [PATCH 1/3] net/ipv4/inet_timewait_sock: Fix inconsistent comments sjpark
2020-01-31 14:54 ` Eric Dumazet
2020-01-31 15:09 ` sjpark
2020-01-31 12:24 ` [PATCH 2/3] tcp: Reduce SYN resend delay if a suspicous ACK is received sjpark
2020-01-31 15:01 ` Eric Dumazet
2020-01-31 16:12 ` sjpark
2020-01-31 16:55 ` Eric Dumazet
2020-01-31 17:05 ` sjpark
2020-01-31 17:08 ` Eric Dumazet
2020-01-31 15:10 ` Neal Cardwell
2020-01-31 18:12 ` Eric Dumazet
2020-01-31 22:11 ` Neal Cardwell
2020-01-31 22:17 ` SeongJae Park
2020-02-01 3:55 ` Neal Cardwell
2020-02-01 6:08 ` SeongJae Park
2020-02-01 13:30 ` Neal Cardwell
2020-01-31 22:53 ` Eric Dumazet [this message]
2020-02-03 15:40 ` David Laight
2020-02-03 15:54 ` Eric Dumazet
2020-01-31 12:24 ` [PATCH 3/3] selftests: net: Add FIN_ACK processing order related latency spike test sjpark
2020-01-31 14:56 ` Eric Dumazet
2020-01-31 15:13 ` sjpark
2020-01-31 14:00 ` [PATCH 0/3] Fix reconnection latency caused by FIN/ACK handling race David Laight
2020-01-31 15:05 ` sjpark
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