On Thu, Sep 10 2009, Mike Galbraith wrote:
> On Thu, 2009-09-10 at 12:28 +0200, Jens Axboe wrote:
> 
> > No difference. Then I tried switching NO_NEW_FAIR_SLEEPERS on, and then
> > I get:
> > 
> >  Performance counter stats for 'xmodmap .xmodmap-carl':
> > 
> >        9.009137  task-clock-msecs         #      0.447 CPUs 
> >              18  context-switches         #      0.002 M/sec
> >               1  CPU-migrations           #      0.000 M/sec
> >             315  page-faults              #      0.035 M/sec
> >   <not counted>  cycles                  
> >   <not counted>  instructions            
> >   <not counted>  cache-references        
> >   <not counted>  cache-misses            
> > 
> >     0.020167093  seconds time elapsed
> > 
> > Woot!
> 
> Something is very seriously hosed on that box... clock?

model name      : Genuine Intel(R) CPU           T2400  @ 1.83GHz

Throttles down to 1.00GHz when idle.

> Can you turn it back on, and do..

I guess you mean turn NEW_FAIR_SLEEPERS back on, correct?

> 	while sleep .1; do cat /proc/sched_debug >> foo; done 
> ..on one core, and (quickly;) xmodmap .xmodmap-carl, then send me a few
> seconds worth (gzipped up) to eyeball?

Attached.

-- 
Jens Axboe