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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Message-Id: <20100630.143424.121243547.davem@davemloft.net>
Date:	Wed, 30 Jun 2010 14:34:24 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	hpa@...or.com
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

From: "H. Peter Anvin" <hpa@...or.com>
Date: Wed, 30 Jun 2010 14:32:33 -0700

> 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>

Applied, thanks everyone.
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