Re: DMA/UDMA on an ACER TM 342
On Mon, 8 Jan 2001, Tobias Bachmor wrote:
> Hi there,
> Duccio Medini wrote:
> > I'm having problems in enabling DMA on my lap...
> > [...]
> > PCI_IDE: unknown IDE controller on PCI bus 00 device 78, VID=10b9,
> > DID=5229
> > [...]
> > - what does DMA disabled (BIOS) means? On my BIOS I wasn't able to find
> > anything on HD DMA... also, my HD it is not in the DMA blacklist....
> It's not your HD, it's ypour controller. Which kernel are you using?
> Something older than 2.2.17 does not have a specific driver for the IDE chipset (which is an ALI 153x, IIRC).
> A newer kernel (or a patched one, see pathes in 'hedrick' on kernel.org) will help - at least it helped for me :)
Thanks a lot: it works! I've patched from 2.2.16 to 2.2.18.
The ALI IDE driver works perfectly, and now DMA
goes up by default. This is the performance upgrade:
Timing buffered disk reads: 64 MB in 16.58 seconds = 3.86 MB/sec
Timing buffered disk reads: 64 MB in 6.39 seconds = 10.02 MB/sec
PhD. Duccio Medini |mobile: +39 347 3343114
|phone: +39 075 5852760
Physics Dept. |
Biophysics Sector |fax: +39 075 44666
Perugia University (ITALY) |Via A. Pascoli
INFM, Perugia Unit |06123 Perugia (I)