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From: Pavel Machek <pavel@ucw.cz>
To: "Ma, Ling" <ling.ma@intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>, "mingo@elte.hu" <mingo@elte.hu>,
	"tglx@linutronix.de" <tglx@linutronix.de>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH RFC] [X86] performance improvement for memcpy_64.S by fast string.
Date: Thu, 12 Nov 2009 13:16:04 +0100	[thread overview]
Message-ID: <20091112121604.GC1394@ucw.cz> (raw)
In-Reply-To: <8FED46E8A9CA574792FC7AACAC38FE7714FCF772C9@PDSMSX501.ccr.corp.intel.com>

On Mon 2009-11-09 15:24:03, Ma, Ling wrote:
> Hi All
> 
> Today we run our benchmark on Core2 and Sandy Bridge:
> 
> 1. Retrieve result on Core2
> Speedup on Core2
>    Len        Alignement             Speedup
>   1024,       0/ 0:                 0.95x 
>   2048,       0/ 0:                 1.03x 

Well, so you are running cache hot and it is only a win on huge
copies... how common are those?

> Application run through perf
> For (i= 1024; i < 1024 * 16; i = i + 64)
> 	do_memcpy(0, 0, i);

							Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

  parent reply	other threads:[~2009-11-12 23:03 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2009-11-06  9:41 [PATCH RFC] [X86] performance improvement for memcpy_64.S by fast string ling.ma
2009-11-06 16:51 ` Andi Kleen
2009-11-08 10:18   ` Ingo Molnar
2009-11-06 17:07 ` H. Peter Anvin
2009-11-06 19:26   ` H. Peter Anvin
2009-11-09  7:24     ` Ma, Ling
2009-11-09  7:36       ` H. Peter Anvin
2009-11-09  8:08         ` Ingo Molnar
2009-11-11  7:05           ` Ma, Ling
2009-11-11  7:18             ` Ingo Molnar
2009-11-11  7:57               ` Ma, Ling
2009-11-11 23:21                 ` H. Peter Anvin
2009-11-12  2:12                   ` Ma, Ling
2009-11-11 20:34             ` Cyrill Gorcunov
2009-11-11 22:39               ` H. Peter Anvin
2009-11-12  4:28                 ` Cyrill Gorcunov
2009-11-12  4:49                   ` Ma, Ling
2009-11-12  5:26                     ` H. Peter Anvin
2009-11-12  7:42                       ` Ma, Ling
2009-11-12  9:54                     ` Cyrill Gorcunov
2009-11-12 12:16           ` Pavel Machek
2009-11-13  7:33             ` Ingo Molnar
2009-11-13  8:04               ` H. Peter Anvin
2009-11-13  8:10                 ` Ingo Molnar
2009-11-09  9:26         ` Andi Kleen
2009-11-09 16:41           ` H. Peter Anvin
2009-11-09 18:54             ` Andi Kleen
2009-11-09 22:36               ` H. Peter Anvin
2009-11-12 12:16       ` Pavel Machek [this message]
2009-11-13  5:33         ` Ma, Ling
2009-11-13  6:04           ` H. Peter Anvin
2009-11-13  7:23             ` Ma, Ling
2009-11-13  7:30               ` H. Peter Anvin

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