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

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Message-ID: <C10D3FB0CD45994C8A51FEC1227CE22F15CC203E71@shsmsx502.ccr.corp.intel.com>
Date:	Fri, 15 Oct 2010 03:43:53 +0800
From:	"Ma, Ling" <ling.ma@...el.com>
To:	"Ma, Ling" <ling.ma@...el.com>, "H. Peter Anvin" <hpa@...or.com>,
	"miaox@...fujitsu.com" <miaox@...fujitsu.com>
CC:	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

Attachment includes memcpy-kernel.c(cc -O2 memcpy-kernel.c -o memcpy-kernel),
and unaligned test cases on Atom.

Thanks
Ling

-----Original Message-----
From: Ma, Ling 
Sent: Thursday, October 14, 2010 9:14 AM
To: 'H. Peter Anvin'; miaox@...fujitsu.com
Cc: Ingo Molnar; Andi Kleen; Thomas Gleixner; Zhao, Yakui; Linux Kernel
Subject: RE: [PATCH V2 -tip] lib,x86_64: improve the performance of memcpy() for unaligned copy

Sure, I will post benchmark tool and benchmark on Atom 64bit soon.

Thanks
Ling

-----Original Message-----
From: H. Peter Anvin [mailto:hpa@...or.com] 
Sent: Thursday, October 14, 2010 5:32 AM
To: miaox@...fujitsu.com
Cc: Ma, Ling; Ingo Molnar; Andi Kleen; Thomas Gleixner; Zhao, Yakui; Linux Kernel
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

Download attachment "memcpy-atom-unaligned-cases" of type "application/octet-stream" (11036 bytes)

View attachment "memcpy-kernel.c" of type "text/plain" (12972 bytes)