[Bug 84662] Long pauses with Unreal demo Elemental on R9270X since : Always flush the HDP cache before submitting a CS to the GPU

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84662

--- Comment #21 from Alexandre Demers <alexandre.f.demers at gmail.com> ---
(In reply to Andy Furniss from comment #18)
> (In reply to Andy Furniss from comment #14)
> 
> > With mesa on the commit before
> > r600g,radeonsi: Set RADEON_GEM_NO_CPU_ACCESS flag for tiled BOs
> > (I don't know yet exactly what mesa commit changed things)
> > 
> > I can with your patch or the stream revert get "good" behavior, this was
> > with a kernel on the "bad" HPD kernel commit.
> > 
> > Will test more over time.
> 
> I haven't tried the patch yet. will do but I got some strange results last
> thing yesterday which will make me hesitant about declaring any patch good
> or bad.
> 
> I started resetting around in mesa and noticed unexpected goods - so I tried
> head and got a good noth with and without 1st patch.
> 
> Rebooted into 3.17-rc7 still good.
> 
> Did some recompiling of llvm/mesa as I had changed my normal setup slightly
> - got bad.
> 
> Repeated resetting mesa to older + patch got good, reset to head again, bad.
> Applied patch on head good, reversed patch on head - still good.
> 
> I am wondering at this time whether card is in some nice state so power
> cycle - still good. Boot into 3.18 still good, clean & recompile the same
> mesa without doing anything else - bad again. Still bad after power cycles.
> 
> I always make distclean + git clean -dfx when doing anything other than
> applying or reversing a patch.
> 
> So it seems that there is some randomness whether I am good or bad between
> mesa build/installs.
> 
> This does not however tally with my kernel bisect which seemed to go
> flawlessly.
> 
> I assume there is no card state that can survive power off.
> 
> So currently a bit confused - as reported by Christoph in the other bug, it
> is possible to have good with vanilla mesa/kernel, but apparently for me the
> "same" mesa can also be bad.
> 
> I did try more clean/rebuild cycles including single thread but am currently
> still bad.

I'm also seeing this behavior while bisecting a different bug on a 7950...
Probably related...

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