[Bug 90137] [ilk] IPS frequently downclocks the GPU when playing quakelive

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90137

--- Comment #16 from dimon at gmx.net ---
(In reply to Chris Wilson from comment #14)
> Enabled, unmasked, but never trigger. Huh.
> 
> I guess add a sanity check that ironlake_enable_drps() is indeed being
> called. Though that should be shown "SW mode enabled" in
> /sys/kernel/debug/dri/0/i915_drpc_info

Sw mode is enabled

> 
> * spots EI intervals and thresholds in there.
> 
> At least I'm getting to know this code better, in theory at least.
> 
> Can you compare
> 
> 92bb36c80e561f82b1f4b63cc269a71833137841 - baseline
> 94afa384a6cddb565d7944c79aa3a2d536e4fe54 - preparation
> 86a8ed9560350c7ca12d2fb7e8d694a2ea4a60cc - conversion to gen6+ RPS routines
> 
> and verify where the bug gets introduced.

86a8ed9560350c7ca12d2fb7e8d694a2ea4a60cc

> 
> (In reply to dimon from comment #13)
> > Wow, after a fresh reboot reclocking worked for a short period of time.
> > I was getting DE_PCU_EVENTs, pstates alternated between 0 and 10.
> > Then it stopped generating DE_PCU_EVENTs and stopped reclocking.
> 
> Ah, that's probably my runtime pm experiments to disable the interrupts when
> idle. If you jump back to 57c6b89256000f038a5bbc65eb745a6ad3858a6c does it
> continue to work even after idle?

no, it doesn't

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