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

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Message-ID: <201206260927.11945.hans.schillstrom@ericsson.com>
Date:	Tue, 26 Jun 2012 09:27:10 +0200
From:	Hans Schillstrom <hans.schillstrom@...csson.com>
To:	David Miller <davem@...emloft.net>
CC:	"eric.dumazet@...il.com" <eric.dumazet@...il.com>,
	"subramanian.vijay@...il.com" <subramanian.vijay@...il.com>,
	"dave.taht@...il.com" <dave.taht@...il.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"ncardwell@...gle.com" <ncardwell@...gle.com>,
	"therbert@...gle.com" <therbert@...gle.com>,
	"brouer@...hat.com" <brouer@...hat.com>
Subject: Re: [PATCH v2 net-next] tcp: avoid tx starvation by SYNACK packets

On Tuesday 26 June 2012 09:11:24 David Miller wrote:
> From: Hans Schillstrom <hans.schillstrom@...csson.com>
> Date: Tue, 26 Jun 2012 07:34:31 +0200
> 
> > The big cycle consumer during a syn attack is SHA sum right now, 
> > so from that perspective it's better to add aes crypto (by using AES-NI) 
> > to the syn cookies instead of SHA sum. Even if only newer x86_64 can use it.
> 
> I'm surprised that x86 lacks an SHA1 instruction, even shitty sparcs
> have one now.
> 
> SHA1 seems overkill for what the syncookie code is trying to do, could
> you give the following a try?
> 

Sure, I'll give it a try later today 

Thanks

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