lkml.org 
[lkml]   [2016]   [Mar]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH 6/6] cpufreq: schedutil: New governor based on scheduler utilization data
    On Thu, Mar 03, 2016 at 03:01:15PM +0100, Vincent Guittot wrote:
    > > In case a more formal derivation of this formula is needed, it is
    > > based on the following 3 assumptions:
    > >
    > > (1) Performance is a linear function of frequency.
    > > (2) Required performance is a linear function of the utilization ratio
    > > x = util/max as provided by the scheduler (0 <= x <= 1).
    >
    > Just to mention that the utilization that you are using, varies with
    > the frequency which add another variable in your equation

    Right, x86 hasn't implemented arch_scale_freq_capacity(), so the
    utilization values we use are all over the map. If we lower freq, the
    util will go up, which would result in us bumping the freq again, etc..

    \
     
     \ /
      Last update: 2016-03-03 17:21    [W:6.865 / U:0.000 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site