<html> <head> <base href="https://bugs.freedesktop.org/" /> </head> <body> <div> <a class="bz_bug_link bz_status_NEW " title="NEW - Borderlands 2: Constant frame rate drops while playing; really bad with additionl lighting" href="https://bugs.freedesktop.org/show_bug.cgi?id=84570#c19">Comment # 19</a> on <a class="bz_bug_link bz_status_NEW " title="NEW - Borderlands 2: Constant frame rate drops while playing; really bad with additionl lighting" href="https://bugs.freedesktop.org/show_bug.cgi?id=84570">bug 84570</a> from <a class="email" href="mailto:ahartmetz@gmail.com" title="Andreas Hartmetz <ahartmetz@gmail.com>"> Andreas Hartmetz</a> <pre>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?</pre> </div> <hr> You are receiving this mail because: <ul> <li>You are the assignee for the bug.</li> </ul> </body> </html>