netdev - Re: [PATCH net-next] ipv6: optimize ipv6 addresses compares

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Date:	Wed, 11 Jul 2012 06:07:58 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org, joe@...ches.com
Subject: Re: [PATCH net-next] ipv6: optimize ipv6 addresses compares

On Tue, 2012-07-10 at 21:02 -0700, David Miller wrote:
> From: Eric Dumazet <eric.dumazet@...il.com>
> Date: Wed, 11 Jul 2012 05:49:18 +0200
> 
> > From: Eric Dumazet <edumazet@...gle.com>
> > 
> > On 64 bit arches having efficient unaligned accesses (eg x86_64) we can
> > use long words to reduce number of instructions for free.
> > 
> > Signed-off-by: Eric Dumazet <edumazet@...gle.com>
> > Cc: Joe Perches <joe@...ches.com>
> 
> Maybe we can even be sure that they are 64-bit aligned too?
> 
> If there's an embedded u64 in the in6_addr union, they really should
> be.
> 
> It can't even be an issue in the protocol headers, because in the
> socket demux we read the two 32-bit ipv4 addresses in the packet
> header as one 64-bit chunk already.

I dont think this 8bytes alignment is possible with ip6tables.



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