netdev - Re: [net-next-2.6 PATCH v2] x86: Align skb w/ start of cacheline on newer core 2/Xeon Arch

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Date:	Wed, 30 Jun 2010 14:28:32 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	jeffrey.t.kirsher@...el.com
Cc:	netdev@...r.kernel.org, gospo@...hat.com, bphilips@...ell.com,
	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
	x86@...nel.org, alexander.h.duyck@...el.com
Subject: Re: [net-next-2.6 PATCH v2] x86: Align skb w/ start of cacheline
 on newer core 2/Xeon Arch

From: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Date: Tue, 29 Jun 2010 21:38:00 -0700

> From: Alexander Duyck <alexander.h.duyck@...el.com>
> 
> x86 architectures can handle unaligned accesses in hardware, and it has
> been shown that unaligned DMA accesses can be expensive on Nehalem
> architectures.  As such we should overwrite NET_IP_ALIGN to resolve
> this issue.
> 
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: "H. Peter Anvin" <hpa@...or.com>
> Cc: x86@...nel.org
> Signed-off-by: Alexander Duyck <alexander.h.duyck@...el.com>
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>

Can I get an x86'er ACK on this?  I can merge it in via net-next-2.6
which is probably most convenient for people who want to see the
networking performance effects of this change.
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