[Bug 89219] arb_uniform_buffer_object-bufferstorage fails now and then

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=89219

--- Comment #6 from Ilia Mirkin <imirkin at alum.mit.edu> ---
(In reply to Ian Romanick from comment #5)
> The sporadic failures are not limited to HSW.  I seem them on IVB as well. 
> I suspect Mark sees them on other platforms.
> 
> Ilia: Did this test ever consistently pass on whatever hardware you
> developed it on?  Also, what hardware was that?
> 
> I'm not sure if this is a bug in Mesa or in the test.

The test passes pretty reliably on nvc0 right now. It definitely didn't
originally and I had to fix up some stuff in the driver... (see commit
9a37eb8adb6558a4abf47774b583cb582a0ae116). I'm fairly sure it passes reliably
on nv50 hw as well (which also had to get similar fixes).

But if it makes you feel better, 'bin/arb_uniform_buffer_object-rendering
offset' fails fairly reliably on nvc0 and I have no clue why.

Basically the NVIDIA chips appear to cache constbuf lookups, so when you change
them behind their backs [and there are also ways to change them in front of
their backs], you have to tell them to flush their caches. I wouldn't be
surprised if there were a similar situation with Intel chips.

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