netdev - Re: [PATCH v2] tcp: reflect SYN queue

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Message-Id: <20120601.142325.1372147261206298305.davem@davemloft.net>
Date:	Fri, 01 Jun 2012 14:23:25 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	hans.schillstrom@...csson.com, netdev@...r.kernel.org,
	ncardwell@...gle.com, brouer@...hat.com, therbert@...gle.com
Subject: Re: [PATCH v2] tcp: reflect SYN queue_mapping into SYNACK packets

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Fri, 01 Jun 2012 13:47:50 +0200

> From: Eric Dumazet <edumazet@...gle.com>
> 
> While testing how linux behaves on SYNFLOOD attack on multiqueue device
> (ixgbe), I found that SYNACK messages were dropped at Qdisc level
> because we send them all on a single queue.
> 
> Obvious choice is to reflect incoming SYN packet @queue_mapping to
> SYNACK packet.
> 
> Under stress, my machine could only send 25.000 SYNACK per second (for
> 200.000 incoming SYN per second). NIC : ixgbe with 16 rx/tx queues.
> 
> After patch, not a single SYNACK is dropped.
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Applied.
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