GARTSize option not documented on radeon and other problems

Zoltan Boszormenyi zboszor at
Thu May 3 23:59:44 PDT 2007

Oliver McFadden írta:
> On 5/3/07, Zoltan Boszormenyi <zboszor at> wrote:
>> Hi,
>> sorry for the crossposting, I don't know who to address.
>> I am experimenting the new CFS scheduler on Linux
>> and tried to start multiple glxgears to see whether
>> they are really running smooth and have evenly
>> distributed framerate.
>> At first I could only start two instances of glxgears
>> but the third didn't start saying that it cannot allocate
>> GART memory and try to increase increase GARTSize.
>> First problem: man radeon doesn't have anything about
>> this option, although contains this keyword.
>> I tried guessing whether the parameter is in MBs and
>> have set it to 128 but it disabled DRI because of some
>> out of memory condition. Setting it to 64 gave me working
>> DRI and I am able to start up some more instances of
>> glxgears.
>> Second problem: if I start 16 of them, the last 3
>> behaves very strange, i.e. instead of the spinning gears
>> I get chaotic flickering triangles. As soon as the number
>> of glxgears goes down to 13 every window behaves
>> normal.
>> Third problem: starting up 32 glxgears locked up the
>> machine almost instantly but having only 16 of them
>> also locks up the machine after some time passed.
>> The machine is x86-64, Athlon64 X2 4200,
>> PCIe Radeon X700 with 128MB onboard memory,
>> up-to-date Fedora Core 6.
>> Best regards,
>> Zoltán Böszörményi
> This is interesting. I've occasionally seen my engine just display a mess of
> triangles, but if I was to kill it and start it again, it would work fine. This
> only happened very occasionally so I could never track down the problem.
> If running more than 13 glxgears shows the problem then maybe it would have a
> chance of getting fixed. :) You might want to open a bug report on the
> Freedesktop Bugzilla.

BZ #10852

> The lockups are nothing new, unfortionally. I think there is a bug somewhere in
> the R300 driver. You can also get deadlocks which are a little different... I
> think that these might go away after R300 uses TTM and thus doesn't grab the
> hardware lock anymore for texture upload, etc.

Is the lockup happens with only multiple GL[X] clients?
I can play hours with Diablo 2 :-) in Wine and it doesn't lock up.

Best regards,
Zoltán Böszörményi

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