extreme CPU usage on CDROM or DVD

Lennart Sorensen lsorense-1wCw9BSqJbv44Nm34jS7GywD8/FfD2ys at public.gmane.org
Thu Oct 16 13:46:24 UTC 2003


On Thu, Oct 16, 2003 at 08:55:09AM -0400, Jason Shein wrote:
> I am running Suse8.2 Pro. Whenever I use the cdrom or the dvd, my cpu
> usage rockets up to 99% and stays there until it is done. This happens
> on writing cd's, transfering data from disk to HD, reading DVD's,
> ripping MP3's etc.
> 
> The CD writer is mounted using SCSI emulation, while the DVD is not. (
> default for some reason on suse 8.2  - which I am currently looking on
> gooogle to howto correct)
> 
> System:
> 
> MSI K7N2 Delta - ILSR
> Nforce2 Chipset - using current drivers
> AthlonXP 2800 Barton CPU
> 1 Gig DDR400 dual channel ram
> 
> memory is not the issue, neither is cpu. I have not seen this behaviour
> before. I have had MDK9.1 on this system with no problems.
> 
> Any ideas?

Are the drives using DMA or PIO?  Check /proc/ide/hd?/settings

Without DMA it will use a lot of cpu.

Use hdparm -d 1 /dev/hd? to enable DMA on a drive.  On most systems with
most drives it works great.  On a few systems it will crash the system,
or make the drive stop working.

Lennart Sorensen
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