lkml.org 
[lkml]   [2006]   [Nov]   [5]   [last100]   RSS Feed
Views: [more markup]  [less markup]  [headers]  [forward] 
 
Messages in this thread
/
From(Eric W. Biederman)
SubjectRe: 2.6.19-rc4: known unfixed regressions (v3)
DateSun, 05 Nov 2006 08:22:20 -0700
Adrian Bunk <bunk@stusta.de> writes:

>
> Subject    : x86_64: NR_IRQ increase causes 11.5% slowdown
>                      in lmbench's fork benchmark
> References : http://lkml.org/lkml/2006/11/2/192
> Submitter  : Tim Chen <tim.c.chen@linux.intel.com>
> Caused-By  : Eric W. Biederman <ebiederm@xmission.com>
>              commit 550f2299ac8ffaba943cf211380d3a8d3fa75301
> Handled-By : Eric W. Biederman <ebiederm@xmission.com>
>              Andi Kleen <ak@suse.de>
> Status     : problem is being debugged

Currently I'm at a loss why the cross cpu fork lm_bench numbers should get
worse when you simply double NR_IRQS.  As far as I can determine nothing
on that code path is directly affected by that change.

Eric
-
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: 2006-11-05 15:25    [from the cache]
©2003-2008