[Bug 81682] [snb] Frequent framerate drops

[bugzilla-daemon at freedesktop.org]

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

--- Comment #15 from Greg Sutcliffe <bugsfreedesktop at emeraldreverie.org> ---
(In reply to comment #11)
> Can you grab a photo of the overlay during the stall? What I am looking for
> this time is whether it is recording long waits and the status of rc6 during
> that period. That the cpu goes up during that time is interesting.

Last night it seemed very unwilling to reproduce properly, but I did get a
period of repeatedly stalling/unstalling so I grabbed a shot of that. You can
see RC6 is around 95%. I'll try to get a proper shot next time it reproduces
correctly

> Now, the next challenge is to grap a perf profile from the good/bad periods.

Conveniently, the one time last night it reproduced the bug properly, I had
*just* finished compiling perf. So, I've attached the output of "perf record -g
-a sleep 2" (gzipped for size) as well as a repeat of that command later on
when it was behaving itself.

> Do you see a noticeable fluctuation in CPU activity during time as well?
> Could you also watch powertop and see how cpufreq fluctuates?

Sadly, as discussed above, it refused to reproduce properly after I installed
powertop. I'll try to watch for this tonight.

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