lkml.org 
[lkml]   [2004]   [Aug]   [21]   [last100]   RSS Feed
Views: [more markup]  [less markup]  [headers]  [forward] 
 
Messages in this thread
/
DateSat, 21 Aug 2004 11:13:38 +0200
FromIngo Molnar <>
SubjectRe: [patch] voluntary-preempt-2.6.8.1-P5
* 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 :-)

	Ingo
-
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    [from the cache]
©2003-2008