[Bug 68718] [snb] vsync hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=68718

--- Comment #17 from Ilia Mirkin <imirkin at alum.mit.edu> ---
(In reply to comment #16)
> Created attachment 93855 [details] [review]
> Serialise DERRMR write
> 
> Sorry, I thought I was being clear when I acknowledged the hang still
> occurred with rc6, and so we need an explanation that doesn't involve rc6.
> 
> Attached is a patch to serialise the write to DERRMR prior to us loading the
> scanline window and waiting upon the result. We've tried this in the past
> but it didn't seem to make any improvement (though iirc that was in
> connection with rc6 hangs + vsync).

Much harder to reproduce with this patch. maps didn't seem to do it anymore.
However I loaded up http://helloracer.com/racer-s/, and after a little while
(30-60s), it hung:

[112245.319716] [drm:ring_stuck] *ERROR* Kicking stuck wait on render ring

Let me know if you'd like the error file. And of course after having closed the
racer down, loading google maps also caused the hang. (Hm, now maps is freezing
a _lot_ again...)

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