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

[Ingo Molnar]

* 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
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