Re: DMA/UDMA on an ACER TM 342

[Duccio Medini <Duccio.Medini@pg.infn.it>]

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:

OLD:

/dev/hda:
 Timing buffered disk reads:  64 MB in 16.58 seconds =  3.86 MB/sec 

NOW:

/dev/hda:
 Timing buffered disk reads:  64 MB in  6.39 seconds = 10.02 MB/sec

Thanks again!
				Duccio

++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
	~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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)
                    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
                    e-mail: duccio.medini@pg.infn.it
                    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++