Re: Unsupported AGP-bridge on VIA VT8633

From: Rogier Wolff (R.E.Wolff@BitWizard.nl)
Date: Tue Dec 03 2002 - 04:53:28 EST


On Thu, Nov 21, 2002 at 11:56:23PM +0100, Stian Jordet wrote:
> tor, 2002-11-21 kl. 23:40 skrev Dave Jones:
> > On Thu, Nov 21, 2002 at 11:20:31PM +0100, Stian Jordet wrote:
> >
> > > You were not really clear here. I tried it as a boot-time argument, because I
> > > have agp-support compiled in. But I guess I could and should try it as a module.
> >
> > Yup. Then do a `modprobe agpgart agp_try_unsupported=1'
> >
> > > I'll do that now. But why do I have to use agp_try_unsupported=1?
> >
> > Because if it works, we can then add it to the ID table.
>
> It works, i think. I get this message when I load it:
>
> Linux agpgart interface v0.99 (c) Jeff Hartmann
> agpgart: Maximum main memory to use for agp memory: 439M
> agpgart: Trying generic Via routines for device id: 3091
> agpgart: AGP aperture is 64M @ 0xf8000000

Hi Dave, Stian,

"Same here": The module loads...

However, I have the impression that it doesn't work. I first noticed
that my Xserver was taking 50% of my CPU while playing videos. This
is much less on all other computers that I tried that on.

Turns out that "write bandwidth" to video memory is less than 40Mb
per second. On another system with the same video card, but with a
supported AGP bridge, I get almost 200Mbyte per second. I'll go and
dig for "testgart" and see what that proves....

                        Roger.

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