On Mon, 8 Jul 2002, José Fonseca wrote:

> On Mon, Jul 08, 2002 at 11:55:55AM +0200, Felix Kühling wrote:
> >Hi,
> >
> >I just read Davids mail about bzflag performance on mach64. Incidentally
> >last night I tried bzflag for the first time on mach64 and it froze the
> >X server reproducibly (tried it twice) just after starting bzflag. By
> >now I found out that it's related to switching the screen resoultion.
> >Without switching it works just fine. When I have bzflag switch to
> >640x480 it fails. I updated just before so I guess I have the latest
> >version of the branch. bzflag version is:
> >
> >BZFlag client, version 1.7e4
> >  protocol 1.7e
> >
> >Symptoms: I start bzflag. It changes resolution to 640x480. For a
> >fraction of a second I see the frame of the status window flashing on
> >the screen. Then it goes black and IIRC the mouse pointer freezes.
> >
> >Here is the kernel log:
> [...]
> >Jul  8 02:23:48 viking kernel: [drm]   0x0051c060:  0x007ffe48 0xd0018000 
>0xc0000000 0x00000000 (head)
>                                                                            ^^^^^^^^^^
> A 0-length buffer was commited to the ring. This is a situation that
> had never been experienced and it wasn't known to cause problems, so it 
> isn't checked by the current code. 
> 
> A fix should be straightforward since these buffers can just be
> dismissed. I'll get back to you when I've done it so that you can test
> again.

I think this is in the clear ioctl.  I already ran into this and fixed it 
in my local tree. It happens when there are no cliprects.  I'll commit the 
fix.  
 
> >Jul  8 02:23:48 viking kernel: [drm]   0x0051c070:  0x00000000 0x00000000 
>0x00000000 0x00000000 (tail)
> [...]
> >
> >This was repeated in about 2 sec intervals until I rebooted.
> >
> 
> José Fonseca
> 
> 
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-- 
Leif Delgass 
http://www.retinalburn.net



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