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Date: Wed, 12 Jun 2019 23:44:30 +0200 From: "Rafael J. Wysocki" <rafael@...nel.org> To: Doug Smythies <dsmythies@...us.net>, Pavel Machek <pavel@....cz> Cc: 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 Wed, Jun 12, 2019 at 4:45 AM Doug Smythies <dsmythies@...us.net> wrote: > > Hi, > > So, currently there seems to be 3 issues in this thread > (and I am guessing a little, without definitive data): > > 1.) On your system Kernel 5.4-rc2 (or 4) defaults to the intel_pstate CPU frequency > scaling driver and the powersave governor, but kernel 4.6 defaults to the > acpi-cpufreq CPU frequency scaling driver and the ondemand governor. Which means that intel_pstate works in the active mode by default and so it uses its internal governor. That governor is more performance-oriented than ondemand and it very well may cause more power to be allocated for the processor - at the expense of the GPU. The lower-than-expected frame rate may result from that, in principle. One way to mitigate that might be to use intel_pstate in the passive mode (pass intel_pstate=passive to the kernel in the command line) along with either ondemand or schedutil as the governor.
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