From: "H. Peter Anvin" <hpa@zytor.com>
To: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: "Ma, Ling" <ling.ma@intel.com>, Ingo Molnar <mingo@elte.hu>,
Ingo Molnar <mingo@redhat.com>,
Thomas Gleixner <tglx@linutronix.de>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH RFC] [X86] performance improvement for memcpy_64.S by fast string.
Date: Wed, 11 Nov 2009 14:39:45 -0800 [thread overview]
Message-ID: <4AFB3D31.6070901@zytor.com> (raw)
In-Reply-To: <20091111203425.GA25401@lenovo>
On 11/11/2009 12:34 PM, Cyrill Gorcunov wrote:
> memcpy_orig memcpy_new
> TPT: Len 1024, alignment 8/ 0: 490 570
> TPT: Len 2048, alignment 8/ 0: 826 329
> TPT: Len 3072, alignment 8/ 0: 441 464
> TPT: Len 4096, alignment 8/ 0: 579 596
> TPT: Len 5120, alignment 8/ 0: 723 729
> TPT: Len 6144, alignment 8/ 0: 859 861
> TPT: Len 7168, alignment 8/ 0: 996 994
> TPT: Len 8192, alignment 8/ 0: 1165 1127
> TPT: Len 9216, alignment 8/ 0: 1273 1260
> TPT: Len 10240, alignment 8/ 0: 1402 1395
> TPT: Len 11264, alignment 8/ 0: 1543 1525
> TPT: Len 12288, alignment 8/ 0: 1682 1659
> TPT: Len 13312, alignment 8/ 0: 1869 1815
> TPT: Len 14336, alignment 8/ 0: 1982 1951
> TPT: Len 15360, alignment 8/ 0: 2185 2110
>
> I've run this test a few times and results almost the same,
> with alignment 1024, 3072, 4096, 5120, 6144, new version a bit slowly.
>
Was the result for 2048 consistent (it seems odd in the extreme)... the
discrepancy between this result and Ling's results bothers me; perhaps
the right answer is to leave the current code for Core2 and use new code
(with a lower than 1024 threshold?) for NHM and K8?
-hpa
next prev parent reply other threads:[~2009-11-11 22:42 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 [this message]
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
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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