----- Original Message ----- > > > ----- Original Message ----- > > On Tue, 02 Dec 2014 14:44:59 -0700 > > "Nathanael D. Noblet" <nathanael@xxxxxxx> wrote: > > > > > On Tue, 2014-12-02 at 21:47 +0100, Jan Kratochvil wrote: > > > > On Tue, 02 Dec 2014 06:30:57 +0100, Nathanael d. Noblet wrote: > > > > > I don't know much about it but I hate how bad my battery life is > > > > > on my laptop... > > > > > > > > My 3 years old Lenovo X220 lasts for 12 hours (powertop reports so) > > > > on Fedora 20 x86_64 with powertop --auto-tune. According to > > > > powertop approx. 5.5W is display backlight and 1W is the rest of > > > > system. > > > > > > > > Just to give a reply that Fedora is not bad on all configs/hardware. > > > > > > Well until yesterday I didn't know that Fedora didn't install / > > > configure any of these packages. I've installed tlp and powertop, I > > > didn't know powertop did anything other than monitor. I'll see what > > > powertop --auto-tune does. I don't even know if the tlp package has > > > enabled anything either. I wonder if having tlp installed and running > > > powertop --auto-tune will conflict / fight each other... > > > > > > Time to try stuff out. > > > > You might also look at tuned... > > > > (I think it was mentioned early in the thread). > > > > tuned-adm profile powersave > > I've probably said this before, but I wouldn't trust tuned one bit, after I > was > told that 1) no measurements were ever taken Well, it's not easy to objectively measure this, results depends heavily on HW, SW, configuration used and things like moon phase - today's HW manage a lot of on its own in FW by utilizing factory algorithms/optimizations, but attempts were made to evaluate efficiency of the powersave profile regularly accross different HW: http://fedoraproject.org/wiki/Test_Day:2013-11-14_Power_management#Basic_2 http://fedoraproject.org/wiki/Test_Day:2013-04-17_Power_Management#Basic_2 http://fedoraproject.org/wiki/Test_Day:2012-10-11_Power_Management#Test_Results http://fedoraproject.org/wiki/Test_Day:2012-04-04_Power_Management#Test_Results https://fedoraproject.org/wiki/Test_Day:2011-09-29_PowerManagement#Test_Results These numbers are not bad at all. The powersave profile is targeted for lowest power consumption. I.e. it throttle down your machine - it sets most of the kernel knobs to "powersave" policy. This can increase you online time if your machine is mostly idle, but it will also increase latency and lowers throughput, so generally balanced profile is better choice for laptop. Patches are welcome, so feel free to do your our measurements/ experiments/scientific research or whatever and provide patches. 2) no attempts to make > beneficial > configurations the defaults were made (which is probably right, given that > they'd > have no data to back it up). > Tuned is tool/framework to ease management of tunings and also provides dbase of well known tunings. You can use it to e.g. fine tune your system for high throughput, then roll-back and re-tune for e.g. low latency. Tunings are also applied to newly added devices. You can use inheritance when constructing your own profiles for your own workloads/scenarios. Great for benchmarking, experiments, for cases when "auto" is simply not good enough and you know what you are doing. Currently the project is receiving mostly patches for performance tuning, but patches for other profiles are also welcome. The goal is to be non distro specific upstream. The goal isn't to press anything to distros defaults regards Jaroslav -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel Fedora Code of Conduct: http://fedoraproject.org/code-of-conduct
