Intel Turbo Mode

cagnulein cagnulein at gmail.com
Wed Feb 27 19:54:09 CET 2019


Thank you for the proposal but I don't have more spare time right now. I
hope to help you in the future.
Roberto Viola

Il mar 26 feb 2019, 19:41 Jan Kiszka <jan.kiszka at siemens.com> ha scritto:

> On 26.02.19 17:35, cagnulein via Xenomai wrote:
> > Hi everybody,
> >    i would like to give my contribution to this incredible project.
> >   In these days i'm working on a Intel Atom E3930 (2 cores 1.3GHz with
> Turbo
> > Mode to 1.8GHz) and Xenomai.
> >   Everything working flawless, except the turbo mode.
> >   Infact, in order to enabling the turbo mode, with the vanilla kernel, i
> > have to enabling ACPI Processor causing high latency on Xenomai (over 350
> > us).
> >
> >   I've create a patch for the vanilla kernel, that allows to enabling the
> > Turbo Mode without adding the ACPI Processor!
> >   In this way i can have cpu at maximum speed with a deterministic and
> low
> > latency (under 36 us!).
> >
> >   Here you can find the patch. Maybe you can add it on ipipe?
> >
>
> Thanks for your contribution! We can consider adding this, I would just
> like to
> double-check first if there aren't also patch-free ways today:
>
> I always wanted to try out the runtime tunings described e.g. on
>
> https://wiki.linuxfoundation.org/realtime/documentation/howto/applications/cpuidle
> to see if we could relax our build-time feature-exclusion set and rather
> do that
> tuning e.g. on Xenomai application startup.
>
> Would you be interested in in playing with such an approach?
>
> Jan
>
> --
> Siemens AG, Corporate Technology, CT RDA IOT SES-DE
> Corporate Competence Center Embedded Linux
>


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