netdev - Re: [PATCH net-next 1/1] tcp: Prevent needless syn-ack rexmt during TWHS

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Date:	Fri, 26 Oct 2012 07:32:09 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Vijay Subramanian <subramanian.vijay@...il.com>
Cc:	netdev@...r.kernel.org, davem@...emloft.net,
	Venkat Venkatsubra <venkat.x.venkatsubra@...cle.com>,
	Elliot Hughes <enh@...gle.com>,
	Eric Dumazet <edumazet@...gle.com>
Subject: Re: [PATCH net-next 1/1] tcp: Prevent needless syn-ack rexmt
 during TWHS

On Fri, 2012-10-26 at 07:06 +0200, Eric Dumazet wrote:

> About earlier patch, this would break :
> 
> tcp_abort_on_overflow - BOOLEAN
...
> And even if tcp_abort_on_overflow is TRUE, earlier patch would break
> some ability to have a momentary burst of SYN packets above the listen()
> backlog.

So instead of sending SYNACK immediately, we could try to defer it a
bit.

But before adding yet another trick, we should evaluate if this is
really needed.

The timer wheel we currently use on the listener socket limits us
because of the granularity of the timer (one single timer for all
requests)



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