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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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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