When I burn or extract audio tracks, the system (RH8.0)
seems to lose about 2/3 of the clock timer interrupts, which
causes the system clock (kernel, not hw RTC) to run about 3X
slow, which loses about 5 minutes while burning and
verifying an audio CD. (I'm digitizing my old vinyl LPs for
my own use, which is perfectly legal.)
Burning data CDs with cdrecord works fine. Burning audio
CDs with cdrecord has the problem. The burner uses ide-scsi
emulation, of course. Reading data CDs works fine if I have
'options ide-cd dma=1' in /etc/modules.conf. Extracting
audio CDs with cdparanoia has the problem. The clock
slowdown problem is accompanied by system time > 50%, which
may indicate PIO rather than DMA when doing audio.
The system is an Iwill P4ES mobo,a 2.4GHz "B" Pentium 4, 1GB
of ECC RAM, Intel 845E chipset, with each drive is on its
own ATA-100 or ATA-133 cable. An 'lspci -v' shows sharing
of IRQ 11 and a few others.
My previous (and only) system was an Alpha with all SCSI
I/O, so I'm new to the IRQ conflict and PIO business.
Ideally, I'd like to get cdrecord (audio mode) and
cdparanoia use DMA rather than PIO to get the CPU use down.
If I can't get the kernel/system clock to keep proper time,
I'll have to buy new SCSI drives and use the IDE ones as