Re: /dev/hd[ijkl] only using udma (not udma 100)

On Mon, 27 May 2002, Simen Timian Thoresen wrote:

> > I booted with:
> > linux ide0=autotune ide1=autotune ide2=autotune ide3=autotune
> > 
> > and now all drives are running just (U)DMA and speeds on the 3 first
> > droped to 15m/s.
> > 
> > The settings file you gave here, is there some possibility to configure
> > settings there? I see things like current_speed and init_speed that would
> > be nice to try and tweak.
> > 
> I believe that file is read only, and that the changes are made with hdparm or 
> autotune.
> 
> I have not tried to change anything yet (I first noticed this yesterday while 
> replacing disks in a raid), but I'll have a go with hdparm when I get home and 
> see what I can shake up.
> 
> I believe you can set trasfer-mode directly using hdparm -x<mode>, but I 
> don't see why the kernel should not set this by default.
> 

Well, as i read the ide .c i see that preconfigureation (if you can call
it that, more like what drives/interfaces do we assume is there), i only
see that for ide0-3. Now ide0-1 is onboard and ide1-2 is the first ide
card but nothing is made with ide4-5 which is the second ide card and i
think that the problem.

It would realy be nice to find a way to force transfer mode on boot up but
i cant see to find any way.