[Bug 45018] [bisected] rendering regression since added support for virtual address space on cayman v11

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=45018

--- Comment #87 from Alexandre Demers <alexandre.f.demers at gmail.com> 2012-08-03 06:03:39 UTC ---
(In reply to comment #86)
> (In reply to comment #85)
> > I found a demo that has the issue, in the demos repository for mesa within the
> > src/demo folder the program 'reflect'.  After I start it up and press 's' to
> > see the stencil buffer the white plan blinks continuously.  Applying the patch
> > 'fixes to wait on the bo and to free the va after the kernel' removes the
> > blinking, as does disabling va through the variable
> > ws->info.r600_virtual_address.
> > 
> > The other issue with the kernel reporting a va conflict is going to be a little
> > harder to reproduce because it appears to be caused by a race condition.
> > 
> > I'll still look for other demos that have the issue.
> 
> Yes, I understand it can be hard to track for you Jerome. Well for the va
> issue, on my side, it is as simple as logging in KDE or Gnome 3. Before logging
> in, there is no va error in dmesg. Once I'm in, there are usually 3 or
> sometimes 6 errors (they are written in block of 3, so I suspect it tries a
> first time and for some reason it fails and try again second time).
> 
> I also experience the issue when watching some movies. With Anthony's patch, va
> issues are gone and I watched a couple of shows yesterday without any problem.
> Before the patch, it would blink and get corrupted after about 16 minutes and
> then crash. So, Anthony has put a finger on something.
> 
> However, I also run piglit tests and some other applications like
> RendererFeatTest64 (which is an application released before Amnesia went out to
> test OpenGL performances if I recall recorrectly). With Anthony's patch, I'm
> still able to lock the display everytime (if I play music at the same time, it
> will continue to play but I won't be able to change terminal even if sometimes
> my mouse pointer can still be moved). RendererFeatTest64 will always lock at
> the same test, but it is not the same for piglit tests (even if it happens
> often at the same or near the same).
> 
> I'm installing a freshly compiled kernel 3.5.0 with both Alex and your patches
> (by the way, they can't be applied on latest drm-next branch) and I'll tell you
> if I'm still experiencing the lockups. I'll also try Anthony's test to see if I
> get the same results (blinking without his patch, OK with it)

Well it still locks up even with the patches. I also tested the reflect demo
and I don't have any blink without Anthony's patch, but we may be experiencing
different symptoms of the same problem.

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