On Sun, 14 Jul 2002, Jos� Fonseca wrote:
> On Thu, Jul 04, 2002 at 06:49:32PM +0100, Jos� Fonseca wrote:
> > On Thu, Jul 04, 2002 at 12:58:13PM -0500, David Willmore wrote:
> > >
> > >I had a lockup on an older version of the mach64 DRI driver, so
> > >I thought I'd retest with a newer one. gltestperf locks up (no
> > >response to keyboard, but mouse still moves--it locked up as well
> > >in the older version) on the ZSmooth Triangles size:480 test.
> > >Not immediately, but it locks up after the second set of triangles
> > >and maybe early into the third.
> > >
> >
> > Thanks for the report.
> >
> > >Here's the relivant stuff from the kernel messages:
> > [...]
> > >
> > >There may have been more, but it didn't make it to the log.
> > >
> > >Any more logging/system configuration info needed?
> > >
> >
> > I'm going to see if I can reproduce it when I finish the current round
> > of changes.
> >
>
> Ok. I've determined the cause of this one: gltestperf floods with DMA buffers
> enough to keep the chip busy for more than 1sec (the current timeout) so
> the DRM thinks the chip locked..!
>
> For instance changing the following line of mach64_ring_idle in mach64_dma.c
>
> for ( i = 0 ; i < dev_priv->usec_timeout; i++ ) {
>
> to
>
> for ( i = 0 ; i < dev_priv->usec_timeout << 4; i++ ) {
>
> does the trick. But we need a more robust implementation of
> mach64_ring_idle. Since we probably want to keep the timeout small
> my suggestion is to count the time that takes for the ring head pointer
> to advance instead of counting the time it takes to finish processing
> all ring entries.
>
> Any other ideas? Have other driver ever faced problems like this one?
A couple of things we could do that might help are to implement frame
aging and/or add the ring space check back in to throttle the frame rate
and limit the amount of pending buffers on the ring.
--
Leif Delgass
http://www.retinalburn.net
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