lkml.org 
[lkml]   [2005]   [May]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [RFC/PATCH 4/5] loop: execute in place (V2)
Christoph Hellwig wrote:

>On Wed, May 18, 2005 at 03:53:52PM +0200, Carsten Otte wrote:
>
>
>>[RFC/PATCH 4/5] loop: execute in place (V2)
>>
>>
>>
>
>This should be ifdef'ed to avoid bloat for non-XIP builds. Or just be dropped
>completely. How much difference does it make over read/write and where does
>loop performance matter?
>
>
I don't think loop on xip is performance critical. For page cache lookup
I see a performance difference of factor 2 on our platform because we
have decent memory bandwidth and lock contention slows things down
with many CPUs. Given that even without this patch we don't do page
cache lookups, I don't think there's much difference. Initially this patch
was written for the old loop driver that won't work without this patch...
Guess that dropping it is a good idea.

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

\
 
 \ /
  Last update: 2005-05-18 16:46    [W:0.031 / U:0.176 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site