lkml.org 
[lkml]   [2009]   [Nov]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH RFC] [X86] performance improvement for memcpy_64.S by fast string.
On 11/09/2009 01:26 AM, Andi Kleen wrote:
> "H. Peter Anvin" <hpa@zytor.com> writes:
>>
>> My personal opinion is that if we can show no significant slowdown on
>> P4, K8, P-M/Core 1, Core 2, and Nehalem then we can simply use this code
>
> The issue is Core 2.
>
> P4 uses a different path, and Core 1 doesn't use the 64bit code.
>

Ling's numbers didn't seem to show a significant slowdown on Core 2 (it
was something like 0.95x baseline in the worst case, and most of the
cases were positive) so Core 2 doesn't seem to have a problem.

-hpa

--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.



\
 
 \ /
  Last update: 2009-11-09 17:45    [W:0.106 / U:0.080 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site