hi ya bruce
> > > >/dev/hda:
> > > > setting using_dma to 1 (on)
> > > > HDIO_SET_DMA failed: Operation not permitted
> > > > using_dma = 0 (off)
> > >
> > > Do it as root
>
> of course
>
> > sometimes .. you have to make sure that the chips and
> > the drive supports DMA ...
> > - ( check the kernel IDE/dma options )
>
> I think it is the chips which don't do DMA.
> circa 1990 hardware
ah ... first problem..... those circa drives supports
multiword dma ... not ultra-dma ....
which exactly is supported...
hdparm -iv /dev/hda will tell you
> command line after boot, right?
>
> hmmm...
> # CONFIG_IDEDMA_AUTO is not set
> # CONFIG_DMA_NONPCI is not set
and if that is the kernel you're booting...
hdparm options int he bootups will not work
> I'm curious about the PIO modes, and if one of those is what is being
> used. Since the drive is defaulting to a DMA mode but the OS isn't
> doing DMA, is the system falling back to PIO and should explicitly
> selecting the best PIO mode be expected to improve performance.
the list of dma options from hdparm -iv wil tell you which
one ( marked w/ * ) your machine is currently using
> gotta lot of reading and fiddling to do
pio vs udma vs dma vs ...
http://www.Linux-1U.net/Disks/
and for system fiddling and tuning
http://www.Linux-1U.net/Tuning
c ya
alvin
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