[Mesa-dev] [Bug 84570] Borderlands 2: Constant frame rate drops while playing; really bad with additionl lighting

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=84570

--- Comment #19 from Andreas Hartmetz <ahartmetz at gmail.com> ---
I've noticed that disabling CPU frequency scaling makes a big difference in the
severity of micro-hangs (3.17, dynamic lights off). My explanation is that,
when threads are waiting for each other, the scheduler doesn't know that the
apparently "idle-blocked" threads would all run faster overall if the CPU went
faster. Doesn't matter if that's wrong, the difference is there...

At least on AMD (some Intel CPUs use a special frequency scaling driver), you
can effectively disable CPU frequency scaling like so:
echo performance | tee /sys/devices/system/cpu/cpu*/cpufreq/scaling_governor

Maybe that also helps a bit with dynamic lights on?

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