On Wednesday 29 October 2014 at 13:00:42, Daniel Hollocher wrote: > Hey folks, > I'm a not expert here, so please forgive the low quality/interest of my > question. > > I'm curious what the ideal systemd way is to set various power management > settings in the /sys tree. For me personally, I'm looking to set > sampling_down_factor as without it, ondemand has terrible performance on my > particular computer (a 10-30% loss compared to performance or conservative). > > Currently, Ubuntu uses a sysv init script to set ondemand after boot, and I > could edit that. It would be cool to know the ideal systemd way, that > could also be aware of power saving stuff. > > From googling, it seems that tempfiles or sysctrl is not the way to go, > since those only happen at boot. Udev? The examples I've found seem to > make basic usage of udev to detect power changes, and then drop to a script > to do the bulk of the work. Is that it?
You could write a bunch of units pulled in by a target... well, two targets, one for power-saving and second for performance mode. And then just start the targets from an udev rule. Just remember to use `--no-block` as udev kills workers after some time. I've already done something along these lines for my own purposes, see https://github.com/intelfx/power-management However, I still want to know if I this is OK wrt systemd "spirit". -- Ivan Shapovalov / intelfx /
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