On 28-Sep-2013 11:30 AM, "Ryan" <ryanphilip...@googlemail.com> wrote: > > Thanks, I understood it! > Now, From the code, i understand that the only if the load goes beyond > 95% - he scales up the frequency. > > Now, If we assume the load to be 50% now and he is running at a X Frequency. > Now, what if the load increases from 50% to 70% - Will he bump it up? > Since it does not cross 95% up threshold?
In the earlier code: yes.. it will inc only if we r above 95.. In the latest code we can inc freq any time.. > Coming back to the load calculation - Load is computed periodically, > But he considers the total wall time or up time right and total idle > time from the beginning. It is not just during the "sampling period" > duration. No.. load is calculated between samples... only > Thanks for your time. > > > /Ryan > > > > On Fri, Sep 27, 2013 at 4:02 AM, Viresh Kumar <viresh.ku...@linaro.org> wrote: > > > > On 27-Sep-2013 1:55 AM, "Ryan" <ryanphilip...@googlemail.com> wrote: > > > >> > >> Let me understand how the downscaling works in the older sources. > >> > >> So, you mean that - > >> > >> 1) Upthreshold = 95% > >> down dif = 5% > >> > >> so, upthreshold - down diff = 90% > >> > >> if load is 85% ; cpu downscaling takes place > >> if load is 75% ; cpu downscaling takes place > >> and so on. > >> > >> So everytime for sampling rate period - work queue checks and finds > >> the load and downscaling takes place if less than 90%. > >> > >> What i did not understand is how down diff will make the cpu remain in > >> the same range for a longer period. > >> > >> Am i missing something. could you please give a detailed answer as i > >> struggling to understand this. > >> > >> Thanks for your time. > > > > Since my first mail, I have been travelling by an overnight bus and sending > > u mail by my phone. And it is still not that easy to type with a phone. > > > > Suppose load is 96, we switch to max freq.. now load toggles between 90 and > > 100 for some time... i.e. it goes to 90, 91, 92...100... but not below 90.. > > > > Then we will not decrease and increase the freq again and again.. but keep > > running at highest freq..
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