Re: [patch] voluntary-preempt-2.6.9-rc1-bk4-R1

[K.R. Foley]

Ingo Molnar wrote:
> * K.R. Foley <kr@xxxxxxxxxx> wrote:
>
>
> > I also have some other traces from this system that I have not seen
> > before on my slower system. For instance this one where we spend ~204
> > usec in __spin_lock_irqsave:
> >
> > http://www.cybsft.com/testresults/2.6.9-rc1-bk12-S0/trace1.txt
> >
> > Or this one where we spend ~203 usec in sched_clock. That just doesn't
> > seem possible.
> >
> > http://www.cybsft.com/testresults/2.6.9-rc1-bk12-S0/trace4.txt
>
>
> seems quite similar to Mark's IDE-DMA related hardware latencies. Does 
> reducing the DMA mode via hdparm reduce these latencies?
>
> 	Ingo
I will give that a try shortly.

kr
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/