Re: Linux 2.4.20-pre4-ac1

From: Anssi Saari (
Date: Fri Aug 23 2002 - 14:30:12 EST

On Fri, Aug 23, 2002 at 06:18:09PM +0100, Alan Cox wrote:
> On Fri, 2002-08-23 at 17:30, Anssi Saari wrote:
> > Audio CD writes hog system if writing at > 4x so that CPU intensive
> > stuff like watching video goes poorly, frames are dropped a lot, even
> Linux audio writes are currently always done PIO. Andrew Morton posted a
> patch for this which I need to dig out and merge.

I thought his patch concerns only reading audio.

Anyway, what I forgot to mention that this slowdown doesn't occur if I
plug the writer to a Promise pdc20265 or CMD649, but both of those have
the random buffer underrun problem which I understand you know about.

That's with earlier kernels, up to 2.4.19-ac4, I haven't tried them
with newer ones, but it seems it's only the VIA 686b southbridge that
has this problem. I've tried the writer on an old Pentium system too,
which has an Intel PIIX3 and no problems with that.
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