m.silentcr...@gmail.com wrote: > > 1) If the performance governor is the default, it means that a lot of > boards will run constantly at overvolted out-of-spec settings by default. > Now, I haven't heard of any issues with boards running at 1.425 or 1.45 > volts. Nevertheless, we don't allow that in mainline by default either, so > I don't think that change is consistant. With the ondemand governor, the > CPU may still use these dvfs settings, but at least it will clock down if > there's no load. > > 2) If the ondemand governor behaves too sluggish on lower frequencies, I > think the logical solution would be to clean up those dvfs tables and > remove these very low frequencies rather than changing the governor so it > won't clock down anymore. Personally, I use 384MHz as minimum frequency on > my A20 boards, just to give one example. > > 3) If the interactive governor performs better than ondemand, why not make > it the default? >
Totally agree with that. Regarding scaling_min_freq I think choosing a reasonable value depends solely on the dvfs settings in use. If lower clockspeeds doesn't differ that mutch in voltage then it makes nearly no difference whether the SoC idles at eg. 60 MHz or 720 MHz. I just ended up with the latter value for Orange Pi PC now. With interactive governor and 720-1200 MHz the Orange Pi performs identical as with performance while Vcore being most of the times at 940mV instead of 1180mV: http://linux-sunxi.org/File:H3_testing_cpufreq_limits.png http://www.orangepi.org/orangepibbsen/forum.php?mod=redirect&goto=findpost&ptid=724&pid=7213&fromuid=29411 Regards, Thomas -- You received this message because you are subscribed to the Google Groups "linux-sunxi" group. To unsubscribe from this group and stop receiving emails from it, send an email to linux-sunxi+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
