> On Thu, 1 Mar 2001, Hylke van der Schaaf wrote:
>
> > With kernet 2.2.18 DMA mode for my harddisks worked just fine,
> > getting IDE DMA working on an AMD7409 controller with kernel 2.4.2 is a problem.
> >
> > questions:
> > Why is DMA disabled on revision < C4?
> > How can I gat DMA working again?
> > in 2.2.18 I get:
> > hylke:/home/hylke# hdparm -tT /dev/hda
> >
> > /dev/hda:
> > Timing buffer-cache reads: 128 MB in 0.89 seconds =143.82 MB/sec
> > Timing buffered disk reads: 64 MB in 2.85 seconds = 22.46 MB/sec
> > ----------------------------
> >
> > All was fine.
> > I compiled 2.4.2, with:
> > CONFIG_AMD7409_OVERRIDE=y
I'm not using this, since my drives are not UDMA66 or UDMA100
> > hylke:/home/hylke# hdparm -v /dev/hda
> >
> > /dev/hda:
> > multcount = 16 (on)
> > I/O support = 1 (32-bit)
> > unmaskirq = 1 (on)
> > using_dma = 0 (off)
> > keepsettings = 0 (off)
> > nowerr = 0 (off)
> > readonly = 0 (off)
> > readahead = 8 (on)
> > geometry = 2495/255/63, sectors = 40088160, start = 0
> > hylke:/home/hylke# hdparm -tT /dev/hda
> >
> > /dev/hda:
> > Timing buffer-cache reads: 128 MB in 0.90 seconds =142.22 MB/sec
> > Timing buffered disk reads: 64 MB in 12.59 seconds = 5.08 MB/sec
I get 148.8 and 12 MB/sec on my IBM-DTTA-351010 drives.
I get the same message about no single word DMA due
to chip revision.
# hdparm -v /dev/hda
/dev/hda:
multcount = 16 (on)
I/O support = 3 (32-bit w/sync)
unmaskirq = 0 (off)
using_dma = 1 (on)
keepsettings = 0 (off)
nowerr = 0 (off)
readonly = 0 (off)
readahead = 8 (on)
geometry = 19650/16/63, sectors = 19807200, start = 0
What does /proc/ide/hda/settings show?
What about /proc/ide/amd74xx ?
-Thomas
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