[paranoia] DMA problem

[H du Plooy]

Hi all,

I have a DVD-ROM and CD-RW hooked up both as ide-scsi drives /dev/sr0
and /dev/sr1 respectively.  Both have DMA enabled, and working, i.e. I
can copy data from CDs or write CDs with cdrecord at 48x without too
much CPU activity - and I can continue using my system.

DMA is definitely on.

With cdparanoia though, if I rip a CD, CPU usage is 100% (user and
system), and the machine is hard to use - even the mouse cursor is
unresponsive.  And this is on a 1.5ghz Athlon.  Clear symptoms of a
drive not using DMA.  While this is going on I can do a hdparm -d
/dev/hdc and it shows me that DMA is in fact on.

The same thing happens when I read or write cds with cdrdao.

Any ideas what might be causing this?

Currently I'm using SuSE 8.2 Pro with stock kernel and the most recent
versions of cdparanoia and cdrdao, but this is not isolated to this
distro - it's been like that on all the ones I've used.

Thanks
Hans

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