netdev - Re: [RFC, PATCH] IPV6 : add 64 bits components in struct in6_addr to speedup ipv6_addr_equal() & ipv6_addr

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Message-Id: <20070430.133749.41636290.davem@davemloft.net>
Date:	Mon, 30 Apr 2007 13:37:49 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	andi@...stfloor.org
Cc:	dada1@...mosbay.com, yoshfuji@...ux-ipv6.org,
	netdev@...r.kernel.org
Subject: Re: [RFC, PATCH] IPV6 : add 64 bits components in struct in6_addr
 to speedup ipv6_addr_equal() & ipv6_addr_any()

From: Andi Kleen <andi@...stfloor.org>
Date: 30 Apr 2007 23:34:20 +0200

> David Miller <davem@...emloft.net> writes:
> > 
> > Unfortunately, as mentioned elsewhere, we're only able to assume
> > 32-bit alignment of ipv6 packet headers and that isn't likely to
> > change any time soon.
> 
> On x86 it would be fine at least -- unaligned access is cheap. I believe
> the same is true for POWER4/5/s390x. Should it be made conditional perhaps?

We have that conditional, it's callet {get,put}_unaligned() but it's
better to fix the infrastructure so that conditionalization isn't
even needed.
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