[Bug 81682] [snb] Frequent framerate drops (cpufreq?)

[bugzilla-daemon at freedesktop.org]

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

--- Comment #33 from Greg Sutcliffe <bugsfreedesktop at emeraldreverie.org> ---
Ok, so after a few days testing each variant, I've noticed the following
behaviours:

With intel_pstate:

As discussed previously, setting the scheduler to "performance" (from
"powersave") dramatically improves the framerate. Slowdowns still happen, but
are less frequent. When they do happen, they last for some considerable time
(minutes or 10s of minutes, rather than seconds). Gaming feels smooth apart
from during the slowdowns.

With acpi_cpufreq:

Slowdowns still happen with this driver, but last for a much shorter timeframe
(a few seconds, typically). Gameplay thus feels less interrupted, but more
stuttering as the slowdowns kick in and the stop again. Changing the cpufreq
scheduler to "performance" from "ondemand" had no effect on the frequency or
duration of the slowdowns. Frequency of slowdown occurance was higher than
pstate-with-performance, but lower than pstate-without-performance.

Certianly, it doesn;t appear to be confined to one driver, although the precise
symptoms vary slightly. Chris, any further ideas for info I can get for you?

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