netdev - Re: [PATCH v2 net-next] tcp: avoid tx starvation by SYNACK packets

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Date:	Wed, 27 Jun 2012 10:02:17 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jesper Dangaard Brouer <brouer@...hat.com>
Cc:	David Miller <davem@...emloft.net>, hans.schillstrom@...csson.com,
	subramanian.vijay@...il.com, dave.taht@...il.com,
	netdev@...r.kernel.org, ncardwell@...gle.com, therbert@...gle.com,
	mph@...h.dk
Subject: Re: [PATCH v2 net-next] tcp: avoid tx starvation by SYNACK packets

On Wed, 2012-06-27 at 09:54 +0200, Jesper Dangaard Brouer wrote:

> Well, that would lead to parallel SYN processing, wouldn't it?

I think we already discussed of the current issues of current code.

Telling people to spread SYN to several cpus is a good way to have a
freeze in case of synflood, because 15 cpus are busy looping while one
is doing progress.

Thats why Intel felt the need of a hardware filter to direct all SYN
packets on a single queue.

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