netdev - Re: DDoS attack causing bad effect on conntrack searches

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Date:	Fri, 23 Apr 2010 11:23:22 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jan Engelhardt <jengelh@...ozas.de>
Cc:	Jesper Dangaard Brouer <hawk@...u.dk>,
	Patrick McHardy <kaber@...sh.net>, hawk@...x.dk,
	Linux Kernel Network Hackers <netdev@...r.kernel.org>,
	Netfilter Developers <netfilter-devel@...r.kernel.org>
Subject: Re: DDoS attack causing bad effect on conntrack searches

Le vendredi 23 avril 2010 à 09:55 +0200, Jan Engelhardt a écrit :
> On Friday 2010-04-23 09:46, Eric Dumazet wrote:
> >Years ago, we had to manually change PAGE_OFFSET, and I remember some
> >machines with PAGE_OFFSET 0xA0000000  (1.5 GB LOWMEM), 
> >or 0xB0000000 (1.25 GB), (PAE off)
> 
> I notice that 0xB0000000, which is now known as LOWMEM_3G_OPT,
> is only available when PAE is off. Would you know the reason for
> that decision? Are some values unsuitable for PAE?
> 

If PAE was on, PAGE_OFFSET must be a 1GB multiple.
This is because of hardware limitations.


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