linux-kernel - Re: [PATCH V2 -tip] lib,x86_64: improve the performance of memcpy() for unaligned copy

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Message-ID: <4CB62543.7000605@zytor.com>
Date:	Wed, 13 Oct 2010 14:31:47 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	miaox@...fujitsu.com
CC:	"Ma, Ling" <ling.ma@...el.com>, Ingo Molnar <mingo@...hat.com>,
	Andi Kleen <andi@...stfloor.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Zhao, Yakui" <yakui.zhao@...el.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V2 -tip] lib,x86_64: improve the performance of memcpy()
 for unaligned copy

On 10/08/2010 02:02 AM, Miao Xie wrote:
> On Fri, 8 Oct 2010 15:42:45 +0800, Ma, Ling wrote:
>> Could you please give us full address for each comparison result,we will do some tests on my machine.
>> For unaligned cases older cpus will crossing cache line and slow down caused by load and store, but for nhm, no necessary to care about it.
>> By the way in kernel 64bit mode, our access mode should be around 8byte aligned.
> 
> Would you need my benchmark tool? I think it is helpful for your test.
> 

If you could post the benchmark tool that would be great.

	-hpa
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