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

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Message-ID: <201206011248.26748.hans.schillstrom@ericsson.com>
Date:	Fri, 1 Jun 2012 12:45:16 +0200
From:	Hans Schillstrom <hans.schillstrom@...csson.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
CC:	netdev <netdev@...r.kernel.org>,
	Neal Cardwell <ncardwell@...gle.com>,
	Jesper Dangaard Brouer <brouer@...hat.com>,
	Tom Herbert <therbert@...gle.com>
Subject: Re: [PATCH] tcp: reflect SYN queue_mapping into SYNACK packets

On Friday 01 June 2012 12:01:21 Eric Dumazet wrote:
> 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.
> 
Great, that was just what I was looking for
Will try to get this on into test to day.

IPv6, do you add that as well ?

-- 
Regards
Hans Schillstrom
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