José Fonseca wrote:
> On Thu, Jul 04, 2002 at 06:49:32PM +0100, José 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?
I had similar troubles with the i810 & moved to the scheme you suggest --
timeout for movement, not completion.
The other cards probably have the same problem, but are harder to keep busy
for that long.
Keith
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