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 14:32:33 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	David Miller <davem@...emloft.net>
CC:	jeffrey.t.kirsher@...el.com, netdev@...r.kernel.org,
	gospo@...hat.com, bphilips@...ell.com, tglx@...utronix.de,
	mingo@...hat.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

On 06/30/2010 02:28 PM, David Miller wrote:
> 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.

Acked-by: H. Peter Anvin <hpa@...or.com>

	-hpa
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