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
next prev 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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