On Sat, Aug 15, 2015 at 12:32 AM, Alberto Aguirre < [email protected]> wrote:
> That will also be the result of the scaling governor. I was surprised too > that arale (Meizu) only has an interactive governor available. > It's quite hard to measure performance consistently and effectively with > such a governor (specially for comparison purposes). > > >I'm more concerned about how can we keep phone graphics performing as > well as they do during touches, even when we're not touching them? > I don't think there's escaping the fact that we will need to tune the > governor to match the Ubuntu workload. > > > > > On Fri, Aug 14, 2015 at 3:55 AM, Daniel van Vugt < > [email protected]> wrote: > >> It's not just frequency either. On arale (Meizu) for example, smoothness >> correlates directly with whether multiple CPU cores are online or not: >> >> cat /sys/devices/system/cpu/online >> >> Usually the kernel only keeps one core online, which makes Unity8 >> stutter. But if you touch it enough then the second core (out of eight) >> comes online and everything is smooth. I wonder if more aggressive use of >> threads might help... >> >> >> >> On 14/08/15 16:48, Daniel van Vugt wrote: >> >>> Hi all, >>> >>> In testing performance optimisations on various phones, I keep running >>> into an annoying hurdle. >>> >>> Although you can optimise your Mir server/clients in such a way that >>> they're smoother more often, there's an additional variable outside of >>> Mir and Unity that gets in the way. That seems to be frequency scaling >>> done by the kernel. Sometimes on desktops too, but I'm mostly concerned >>> about phones here. >>> >>> I find it suspicious that on some devices you can turn stuttering into >>> smoothness just but touching the screen a lot. But the smoothness soon >>> goes away when you're not touching the screen. In the extreme case, if >>> you're logged into the phone remotely you will also notice the system >>> can become unusably slow when the screen has turned off. That's useful >>> for a real phone's battery life, but it serves to illustrate that the >>> kernel is doing a lot behind the scenes. I'm more concerned about how >>> can we keep phone graphics performing as well as they do during touches, >>> even when we're not touching them? >>> >>> I'm not sure these are what you want to, but if you're testing on Arale, you can enable cpus by /proc/hps/num_base_perf_serv [# of little] [# of bigs] ex) sudo /proc/hps/num_base_perf_serv 2 2 (2 littles and 2 bigs) and also can set gpu with the max freq by echo 0 > /sys/module/pvrsrvkm/parameters/gpu_dvfs_enable (though I'm recommending this only for testing.) - Daniel >>> >>> >> -- >> Unitymirteam mailing list >> [email protected] >> Modify settings or unsubscribe at: >> https://lists.canonical.com/mailman/listinfo/unitymirteam >> > > > -- > Mir-devel mailing list > [email protected] > Modify settings or unsubscribe at: > https://lists.ubuntu.com/mailman/listinfo/mir-devel > > -- Chunsang(Paul) Jeong
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