On 15/11/12 21:06, Francesco Mazzoli wrote: > With `conservative' or `performance' the CPU scales up correctly (well, with > performance it is always scaled up). With `ondemand' it doesn't. > > This has noticeable consequences: compiling is slow, flash videos are > sluggish. > So I do have a problem. And I want a governor that scales down my CPU, > especially on battery. I could stick with `conservative' but I'd like to get > to > the bottom of this since `ondemand' is usually the best option for modern > CPUs.
Actually I use 'conservative' over the 'ondemand' governor. It can be tweaked to react more quickly, close to the speed of 'ondemand', but it has the nice feature of providing a "cool-down" period during which if some task comes along and storms the CPU, the CPU is already at maximum speed, so no need to scale up; this helps with minuscule (but noticeable) interruptions in multimedia apps (with video is most noticeable). Give 'conservative' a try, you might like it. Here are the values that I use (install 'sysfsutils' and put them in /etc/sysfs.conf): ---->8-- # by default it's 444, so we have to change permissions to be able to change values #mode devices/system/cpu/cpufreq/conservative = 644 devices/system/cpu/cpufreq/conservative/freq_step = 10 devices/system/cpu/cpufreq/conservative/up_threshold = 45 # no need to set ignore_nice_load here. It's set by laptop-mode #devices/system/cpu/cpufreq/conservative/ignore_nice_load = 1 devices/system/cpu/cpufreq/conservative/sampling_down_factor = 9 devices/system/cpu/cpufreq/conservative/sampling_rate = 120000 ---->8-- Also here are some helpful links that I used when I tweaked my 'conservative': - http://wiki.debian.org/HowTo/CpuFrequencyScaling - http://www.pantz.org/software/cpufreq/usingcpufreqonlinux.html - https://wiki.archlinux.org/index.php/CPU_Frequency_Scaling - http://en.gentoo-wiki.com/wiki/CPU_Frequency_Scaling - http://git.kernel.org/?p=linux/kernel/git/stable/linux-stable.git;a=blob;f=Documentation/cpu-freq/governors.txt;h=c7a2eb8450c226b50e55b28f8c6669c6041cc0e3;hb=HEAD -- Adrian Fita -- To UNSUBSCRIBE, email to [email protected] with a subject of "unsubscribe". Trouble? Contact [email protected] Archive: http://lists.debian.org/[email protected]
