On 2019.07.03 08:16 Daniel Lezcano wrote: > On 03/07/2019 16:23, Doug Smythies wrote: >> On 2019.06.20 04:58 Daniel Lezcano wrote:
... >> Anyway, I did a bunch of tests and such, but have deleted >> most from this e-mail, because it's just noise. I'll >> include just one set: >> >> For a work load that would normally result in a lot of use >> of shallow idle states (single core pipe-test * 2 cores). > > Can you share the tests and the command lines? Yes, give me a few days to repeat the tests and write it up properly. I am leaving town in an hour and for a day. It'll be similar to this: http://www.smythies.com/~doug/linux/idle/teo8/pipe/index.html parent page (which I will do a better version): http://www.smythies.com/~doug/linux/idle/teo8/index.html ... >> I got (all kernel 5.2-rc5 + this patch): >> >> Idle governor, teo; CPU frequency scaling: intel-cpufreq/ondemand; >> Processor package power: 40.4 watts; 4.9 uSec/loop >> >> Idle governor, teo; CPU frequency scaling: intel-cpufreq/ondemand; >> Processor package power: 34 watts; 5.2 uSec/loop >> >> Idle governor, mobile; CPU frequency scaling: intel-cpufreq/ondemand; >> Processor package power: 25.9 watts; 11.1 uSec/loop >> >> Idle governor, menu; CPU frequency scaling: intel-cpufreq/ondemand; >> Processor package power: 34.2 watts; 5.23 uSec/loop >> >> Idle governor, teo; CPU frequency scaling: intel-cpufreq/ondemand; >> Maximum CPU frequency limited to 73% to match mobile energy. >> Processor package power: 25.4 watts; 6.4 uSec/loop > > Ok that's interesting. Thanks for the values. > > The governor can be better by selecting the shallow states, the > scheduler has to interact with the governor to give clues about the > load, that is identified and will be the next step. > > Is it possible to check with the schedutil governor instead? Oh, I already have some data, just didn't include it before: Idle governor, teo; CPU frequency scaling: intel-cpufreq/schedutil; Processor package power: 40.4 watts; 4.9 uSec/loop Idle governor, mobile; CPU frequency scaling: intel-cpufreq/schedutil; Processor package power: 12.7 watts; 19.7 uSec/loop Idle governor, teo; CPU frequency scaling: intel-cpufreq/schedutil; Idle states 0-3 disabled (note: Idle state 4 is the deepest on my system) Processor package power: 36.9 watts; 8.3 uSec/loop In my notes I wrote: "Huh?? I do not understand this result, as I had expected more similar to the mobile governor". But I did not investigate. Anyway, the schedutil test is the one I'll repeat and write up better. ... Doug
