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Date:	Mon, 17 Dec 2007 15:15:48 +0100
From:	Patrick McHardy <>
To:	Sami Farin <>
CC:	David Miller <>,,,,
Subject: Re: [NETFILTER] xt_hashlimit : speedups hash_dst()

Sami Farin wrote:
> On Sat, Dec 15, 2007 at 21:42:19 -0800, David Miller wrote:
>> From: Eric Dumazet <>
>> Date: Sat, 15 Dec 2007 12:04:47 +0100
>>> I prefer to let admins chose their size, since it makes attacker life more 
>>> difficult :)
>>> For example, I can tell you I have a server, were size is between 2.000.000 
>>> and 3.500.000, I dont want to be forced to use 2097152
>>> A multiply is cheap, at least on current hardware.
>> I agree, and I see nothing wrong with Eric's patch and it
>> should be merged ASAP.
> You could do the same optimization for 
> net/netfilter/nf_conntrack_core.c:__hash_conntrack() , too.

Yes, I already took care of that for conntrack and other netfilter
non-power-of-two hashes.

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