On Tue, 2006-03-14 at 01:50 -0500, Lee Revell wrote:
> On Tue, 2006-03-14 at 07:40 +0100, Mike Galbraith wrote:
> >> >
> > > echo 64 > /sys/block/hd*/queue/max_sectors_kb
> > >
> > > There is basically a straight linear relation between whatever you set
> > > this to and the maximum scheduling latency you see. It was developed to
> > > solve the exact problem you are describing.
> >
> > <head-scratching>
> >
> > Is it possible that you mean pci latency? I'm unable to measure any
> > scheduling latency > 5ms while pushing IO for all my little Barracuda
> > disk is worth.
>
> It's only a big problem if LBA48 is in use which allows 32MB of IO to be
> in flight at once, this depends on the size of the drive.
This is a 120G drive.
>
> What does that value default to?
512.
> > I _can_ generate mp3 player audio dropout though,
> > despite mp3 files living on a separate drive/controller.
> >
>
> Does this go away if you run the mp3 player at nice -20?
Nope.
-Mike
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