RV710 much slower on kms

[Dr. David Alan Gilbert]

* Dave Airlie (airlied at gmail.com) wrote:
> On Sat, Dec 26, 2009 at 2:54 AM, Dr. David Alan Gilbert
> <dave at treblig.org> wrote:
> > Hi,
> >  I'm running an RV710 on 2.6.33-rc2 and it works great without KMS;
> > but with KMS it's a lot slower and I can see X eating a lot of CPU
> > even when not much is happening.
> >
> >  It seems to start off OK, but then really starts eating it - I've
> > seen X eating ~80% of one core running a simple flash game, and even
> > saw the system when apparently idle eating over 50% of one core
> > (but that stopped after reboot). The CPU is an i7-860.
> > The time in that last idle case all seems to be userspace time,
> > strace'ing X shows it was doing a lot of ioctl's to the DRI.
> >
> >  I'm running X 1.6.5 (I'm using the Ubuntu xorg-edgers packages for everything
> > other than the kernel; I'm on Ubuntu 9.10 as the base system).
> >
> > I've included two xorg.0.log's; one with kms and one without.
> >
> > If you need any other debug, just ask.
> 
> Get a new X server really is the answer, 1.7.x has improved EXA
> mainly to deal with kms drivers. radeon KMS on pre-1.7 servers isn't
> something I'd forsee a distro wanting to ship.

With a newer X server it works great.  I'm now
running 1.7.99.2 (still on 2.6.33rc2), using the xorg-edgers
packages for Ubuntu Intrepid.

Great work!

Dave
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