[Bug 81682] [snb] Frequent framerate drops

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81682

--- Comment #8 from Greg Sutcliffe <bugsfreedesktop at emeraldreverie.org> ---
(In reply to comment #7)
> That's different to what I was expecting. I thought that the gpufreq would
> drop, but the game would still be struggling to render. 

Maybe I'm misunderstanding, but that is what I'm seeing - the gpufreq drops to
minimum, and the framerate drops with it. Both seem to recover at the same time
too. It's not just the game either - the whole desktop (both monitors, and
multiple workspaces) become very jerky too. Or do you mean complete hangs when
you say "struggling to render"?

> That it is still
> rendering excludes the possibility of a stall (either pageflip or an
> outright GPU hang), but you might as well double-check with that kernel you
> compiled didn't detect something and attach the dmesg.

I did a reboot, and a dmesg -c before starting the game. Attached it's what's
in dmesg after the first fps drop. Nothing in i915_error_state though.

> Now, the next challenge is to grap a perf profile from the good/bad periods.
> (That's the type of integration that we want into the GPU monitoring tools,
> but we don't have today.)

Do you have any docs I can follow on how to do that manually then, since it's
not already in the tools?

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