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

Ma, Ling
2010-10-14T01:16:27Z

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

Thanks
Ling

-----Original Message-----
From: H. Peter Anvin [mailto:hpa@zytor.com]
Sent: Thursday, October 14, 2010 5:32 AM
To: miaox@cn.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