Re: How how latent should non-preemptive scheduling be?

[Sitsofe Wheeler]

Arjan van de Ven wrote:
> On Wed, 17 Sep 2008 22:48:55 +0100
> Sitsofe Wheeler <sitsofe@xxxxxxxxx> wrote:
>
> > Arjan van de Ven wrote:
> > > this says you haven't done "make install" on the latencytop
> > > directory so it's not translating things for you.. can you do that
> > > please?
> > > Cause                                                Maximum
> Percentage 
>
> Scheduler: waiting for cpu                        208 msec         59.4 %
>
>
> you're rather CPU bound, and your process was woken up but didn't run for over 200 milliseconds..
> that sounds like a scheduler fairness issue!

I'm at a bit of a loss to explain this. I'm not using the group 
scheduler and the load average is less than 0.4. CPU usage does seem to 
spike a fair bit (I'm not sure why rhythmbox needs 50%+ for decoding 
oggs from time to time) but there always seems to be 20% CPU free...

I don't know where to start debugging this one and I'm suspicious of the 
way the problem would happen every 30 seconds too... (this laptop is 
using ath5k for its wifi)
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