Re: FYI: 15x 2D performance decrease in radeon driver KMS

[Sylvain Beucler <beuc@beuc.net>]

Hi,

On Mon, Jun 07, 2010 at 03:57:58PM +0200, Bruno Kleinert wrote:
> Am Samstag, den 29.05.2010, 10:34 +0200 schrieb Sylvain Beucler:
> > Hi,
> > 
> > When testing the radeon driver we'll get in Squeeze, I noticed that a
> > performance regression: 2D operations are currently around 15x slower
> > in the now-default KMS mode (kernel-based mode-setting).
> > http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=583604#30
> > http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=583653
> > 
> > This means that all non-OpenGL games become unplayable or very choppy.
> > 
> > While discussing with the package maintainer, I had the unsafe
> > impression that they were more obsessed about enabling KMS (and
> > stopping non-KMS maintenance) rather than perserving performances.
> > 
> > I hope this will get fixed for Squeeze :/
> Can you name some games to test? I'm running radeon+KMS+compiz ontop of
> a r6xx GPU and this works perfectly - except for WebKit applications,
> they scroll choppy ;)
> 
> Btw. I wouldn't count on UMS anymore because a userspace application
> shouldn't interact with hardware direclty and therefor also requires the
> application to run as root. Nowadays I'd considere UMS and it's
> requirements as a bug.

It's probably best to comment on the bug reports, that's where the
discussion happens (and where you'll find the details you requested).

-- 
Sylvain