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  From: Jon M. Taylor <taylorj@gaia.ecs.csus.edu>
  To  : ggi-develop@eskimo.com
  Date: Mon, 10 May 1999 18:02:59 -0700 (PDT)

Re: MMIO accel with kgicon drivers.

On Mon, 10 May 1999, =?iso-8859-1?Q?Jonas_Borgstr=F6m?= wrote:

> Hi, all
> 
> I have recently tried XGGI, and it works great. I first tried the matroxfb
> driver, it was fast but I didn't manage to get any resolution bigger than
> 640x480. And after using fbset a while I had to reboot the computer.
> After that I tried my old Matrox Millennium driver, and it worked in all
> resolutions but, because it uses ioctrls to accelerate it is a lot slower
> than the matroxfb driver that uses direct mmio accel.
> 
> So, what should I do:
> 
> Should I try to use the matroxfb and somehow get my resolution
> (1024x768x16), but I like kgicon with and the generic monitor driver and
> setmon.
> 
> Or should I update my driver to use mmio acceleration?

	MMIO acceleration is a security hole.  What is really needed for a
good solution to this problem is accel-operation FIFOs to reduce the
number of kernel-user transitions, as this is what kills performance.
Steffen's new KGI 0.9 design has exactly this, for exactly this reason.

Jon 

---
'Cloning and the reprogramming of DNA is the first serious step in 
becoming one with God.'
	- Scientist G. Richard Seed

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