lkml.org 
[lkml]   [2004]   [Aug]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [patch] voluntary-preempt-2.6.8.1-P5
From
Date
On Sat, 2004-08-21 at 05:13, Ingo Molnar wrote:
> * Lee Revell <rlrevell@joe-job.com> wrote:
>
> > On Fri, 2004-08-20 at 09:30, Ingo Molnar wrote:
> >
> > > - reduce ZAP_BLOCK_SIZE to 16 when vp != 0. This pushes the exit
> > > latency down to below 100 usecs on Lee Revell's box.
> > >
> >
> > Almost:
> >
> > http://krustophenia.net/testresults.php?dataset=2.6.8.1-P6#/var/www/2.6.8.1-P6/trace8.txt
>
> i suspect if you turn off tracing (or disable it in the kernel
> completely) then you'd see below-100 usec latencies here. A trace entry
> costs ~0.3 usecs on your box, so this 50-entry trace has roughly 15
> usecs of tracing overhead :-)
>

FWIW, I did see one of these over 200 usecs.

Lee

-
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: 2005-03-22 14:05    [W:0.230 / U:3.768 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site