Re: Can't enable DMA
I'm using 3.0r0 (2.4.18-bf2.4 kernel) with ASRock K7VT2 m/board and Maxtor
30GB ATA133 hard disk.
I tried switching on DMA using hdparm -d1 /dev/hda but got the following
error message:
HDIO_SET_DMA failed: Operation not permitted
Above was running as root. The hdparm -c and -m flags do what they are
supposed to,
it's just the -d1 that I can't get to work.
I have an identical disk with Red Hat 8.0 (2.4.18-14 kernel) and DMA works
without a problem
on this. Disk read speed as tested by hdparm is around 49MB/sec with DMA
and 7MB/sec without.
Anyone know how I can enable DMA on the 3.0r0 system?
/var/log/messages reports `VP_IDE: Unknown VIA Southbridge' in 3.0r0,
and `VP_IDE: VIA vt8235 (rev 00) IDE UDMA133 controller on pci00:11.1' in
Red Hat 8.0
It looks to me like there's a driver missing in 3.0r0 (or existing driver
is incompatible).
Can anyone confirm this and/or suggest a workaround?
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