growisofs / system load / dma setting

["Thomas Fritzsche" <tf@noto.de>]

Hi all,

I'm using growisofs -Z /dev/hdc=/link/to/iso.iso to burn DVD-Video's.
This works, BUT the system load is very high while burning. I'l checked
DMA setting but DMA is on (and 32 bit). I googled around but can not find
a solution. I tried again and found that after burning dma is off!? I
checked dmesg and found message:
--------------------------------------
hdc: irq timeout: status=0xd0 { Busy }
hdc: irq timeout: error=0xd0LastFailedSense 0x0d
hdc: DMA disabled
hdc: ATAPI reset complete
--------------------------------------
I tested a few times and sometimes only the system load is very high but
DMA  is still set after the run, but often DMA setting is disabled and I
get the message above.

My system configuration is:

uname -a
Linux vdr.noto.de 2.4.27-ctvdr-1 #1 Fri Oct 15 18:38:29 UTC 2004 i686
GNU/Linux

hdparm -i /dev/hdc


/dev/hdc:

 Model=_NEC DVD_RW ND-3500AG, FwRev=2.16, SerialNo=
 Config={ Removeable DTR<=5Mbs DTR>10Mbs nonMagnetic }
 RawCHS=0/0/0, TrkSize=0, SectSize=0, ECCbytes=0
 BuffType=unknown, BuffSize=0kB, MaxMultSect=0
 (maybe): CurCHS=0/0/0, CurSects=0, LBA=yes, LBAsects=0
 IORDY=yes, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
 PIO modes:  pio0 pio1 pio2 pio3 pio4
 DMA modes:  mdma0 mdma1 mdma2
 UDMA modes: udma0 udma1 *udma2
 AdvancedPM=no

 * signifies the current active mode

------------------------------

Is this a growisofs problem or a kernel problem? What causes this trouble?
What can I do to avoid this problems.

Thanks for any help and kind regards,
 Thomas Fritzsche