[paranoia] DMA problem

[Steve Smith]

I have similar problems. My system 1Ghz Athlon MSI K7T266. When running 
cdparanoia open another xterm and run dmesg. Look for missing interrupts 
or buffer over runs thats is what I see. I have a good experience with 
the 2.4.21 kernel. Using 2.4.21 and with ide-scsi emulation on both of 
my CD roms I can use cdparanoia on the 48X CD rom with out any 
problems.  My 52X CD-RW still fails with missing interrupts.
It is interesting to see that other than ripping CD(s) the CDroms work 
perfectly on my system. The problems never occur with Win2K.

The 2.4.21 kernel is at kernel.org.

Hope this helps.

Steve

H du Plooy wrote:

>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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