[plug] massive CPU activity on CD writing, cdda rips, etc

[Cameron Patrick]

On Mon, Jan 27, 2003 at 01:43:15AM +0800, Craig Ringer wrote:

| So ... this can't be right. I can't reliably write a CD at > 24x on a 
| modern fast machine. Anybody have any idea what's going on? My old 8x 
| burner wasn't a problem but that could be due to my failure to actually 
| notice the CPU load.

Hrm, I have an 8x CD burner and it takes up about 30% cpu time on my
800MHz Duron with DMA disabled.  With DMA enabled, the machine locks
hard a couple of minutes after you try to use it :(  It's not a hardware
problem, the drive works fine in Windows with (almost) no CPU load
and DMA enabled.

| 
| Anybody have any idea what's going on?
| 

I seem to recall reading somewhere (on the Ogg Vorbis list?) that the 2.2 and
2.4 kernels don't support DMA in all situations (e.g. audio ripping)
with IDE-SCSI.  Monty said that there was a patch that enabled it for
audio ripping which broke cdparanoia's error checking badly.

Cheers,

Cameron.