linux-kernel - Re: 5.2-rc2: low framerate in flightgear, cpu not running at full speed, thermal related?

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Date:   Tue, 18 Jun 2019 10:34:50 +0200
From:   Pavel Machek <pavel@....cz>
To:     Doug Smythies <dsmythies@...us.net>
Cc:     "'Rafael J. Wysocki'" <rafael@...nel.org>,
        'kernel list' <linux-kernel@...r.kernel.org>,
        'ACPI Devel Maling List' <linux-acpi@...r.kernel.org>,
        "'Zhang, Rui'" <rui.zhang@...el.com>,
        "'Rafael J. Wysocki'" <rjw@...ysocki.net>,
        'Viresh Kumar' <viresh.kumar@...aro.org>,
        'Linux PM' <linux-pm@...r.kernel.org>,
        'Thomas Gleixner' <tglx@...utronix.de>,
        'Ingo Molnar' <mingo@...hat.com>,
        'Borislav Petkov' <bp@...en8.de>,
        "'H. Peter Anvin'" <hpa@...or.com>,
        'the arch/x86 maintainers' <x86@...nel.org>
Subject: Re: 5.2-rc2: low framerate in flightgear, cpu not running at full
 speed, thermal related?

On Tue 2019-06-18 01:20:01, Doug Smythies wrote:
> On 2019.06.13 01:53 Rafael J. Wysocki wrote:
> 
> > I personally doubt that any thermal throttling is involved here.
> 
> In earlier e-mails on this thread, Pavel showed his core and package
> temperatures as 97 and 98 degrees. If thermal throttling is not
> involved, it should be. The description of the observed CPU
> frequencies also matched my experiences with thermal throttling
> for the intel-pstate/powersave example. Myself, I can not determine
> if throttling is involved for the acpi-cpufreq/ondemand
> case, just from the clock frequencies, because,
> at least on my system, it uses the kidle_inject method
> instead of the pstate method.

Yes, I'm pretty sure it is thermal throttling. System is running >
3GHz when cold, and going below 2GHz when hot...

And I'm pretty sure the throttling works, too, because temperature
goes to ~98C quickly, and stays there.

Best regards,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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