From: Eric Dumazet <eric.dumazet@gmail.com>
To: Yuchung Cheng <ycheng@google.com>
Cc: davem@davemloft.net, ncardwell@google.com, edumazet@google.com,
hagen@jauu.net, netdev@vger.kernel.org
Subject: Re: [PATCH net-next] tcp: reset timer after any SYNACK retransmit
Date: Mon, 29 Apr 2013 11:54:19 -0700 [thread overview]
Message-ID: <1367261659.8964.332.camel@edumazet-glaptop> (raw)
In-Reply-To: <1367261091-28052-1-git-send-email-ycheng@google.com>
On Mon, 2013-04-29 at 11:44 -0700, Yuchung Cheng wrote:
> Linux immediately returns SYNACK on (spurious) SYN retransmits, but
> keeps the SYNACK timer running independently. Thus the timer may
> fire right after the SYNACK retransmit and causes a SYN-SYNACK
> cross-fire burst.
>
> Adopt the fast retransmit/recovery idea in established state by
> re-arming the SYNACK timer after the fast (SYNACK) retransmit. The
> timer may fire late up to 500ms due to the current SYNACK timer wheel,
> but it's OK to be conservative when network is congested. Eric's new
> listener design should address this issue.
>
> Signed-off-by: Yuchung Cheng <ycheng@google.com>
> ---
Acked-by: Eric Dumazet <edumazet@google.com>
next prev parent reply other threads:[~2013-04-29 18:54 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-04-29 18:44 [PATCH net-next] tcp: reset timer after any SYNACK retransmit Yuchung Cheng
2013-04-29 18:54 ` Eric Dumazet [this message]
2013-04-29 18:57 ` Neal Cardwell
2013-04-29 19:17 ` David Miller
2013-04-29 22:13 ` Yuchung Cheng
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