On Tue, Oct 19, 2004 at 10:18:18PM +0100, Mark Cullen wrote:
I have a rather old machine acting as a home server. According to dmesg it has a:
--
atapci0: <Intel PIIX WDMA2 controller> port 0xffa0-0xffaf,0x376,0x170-0x177,0x3f6,0x1f0-0x1f7 at device 7.1 on pci0
--
However, both hard disks attached are running in PIO mode.
-- ad0: 4103MB <ST34321A> [8894/15/63] at ata0-master BIOSPIO ad2: 6194MB <IBM-DADA-26480> [13424/15/63] at ata1-master BIOSPIO --
I tried running the following, but as you can see the end result is that they are still running BIOSPIO.
-- (root|bone)/home/mrboo# atacontrol mode 0 WDMA2 WDMA2 Master = BIOSPIO Slave = BIOSPIO --
Any suggestions as to how I might enable some sort of DMA on these drives? Since the machine is rather slow (133MHz) and it's currently using polled IO I am sure it will likely benefit me, even if it isn't quite UDMA :)
You should check out the following sysctl variables:
Good call!
hw.ata.ata_dma hw.ata.atapi_dma
These are readonly at runtime, so need to be set at boot in the file /boot/loader.conf. You can add the them like so:
Unfortuantly...
(mrboo|bone)/home/mrboo$ sysctl hw.ata. hw.ata.ata_dma: 1 hw.ata.wc: 0 hw.ata.atapi_dma: 0
ATAPI is just CD drives isn't it? Mainly? If that's the case 0 is ok for that one, as it doesn't have a CD drive anymore.
hw.ata.ata_dma=1 hw.ata.atapi_dma=1
Also, as I understand it, 80 conductor ribbon cables were only recommended at UDMA modes <=2, but perhaps you might consider using one just to be safe.
Well I can't use a newer cable on one of the drives as it is a laptop drive, using one of those 'special' laptop cable things :-)
Thanks, but any other ideas as to why it won't enable? I don't seem to get any messages out of it, just doesn't want to do anything by the looks of it!
Nathan
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