From: "Rafael J. Wysocki" <rafael@kernel.org>
To: Doug Smythies <dsmythies@telus.net>, Pavel Machek <pavel@ucw.cz>
Cc: kernel list <linux-kernel@vger.kernel.org>,
ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
"Zhang, Rui" <rui.zhang@intel.com>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Viresh Kumar <viresh.kumar@linaro.org>,
Linux PM <linux-pm@vger.kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
"H. Peter Anvin" <hpa@zytor.com>,
"the arch/x86 maintainers" <x86@kernel.org>
Subject: Re: 5.2-rc2: low framerate in flightgear, cpu not running at full speed, thermal related?
Date: Wed, 12 Jun 2019 23:44:30 +0200 [thread overview]
Message-ID: <CAJZ5v0j2pb2WxSA+S44Mr-6bpOx-P9A_T2-sDG3CiWSqLMg3sA@mail.gmail.com> (raw)
In-Reply-To: <007701d520c7$c397bda0$4ac738e0$@net>
On Wed, Jun 12, 2019 at 4:45 AM Doug Smythies <dsmythies@telus.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.
next prev parent reply other threads:[~2019-06-13 17:16 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-09 11:17 5.2-rc2: low framerate in flightgear, cpu not running at full speed, thermal related? Pavel Machek
2019-06-09 11:23 ` Pavel Machek
2019-06-09 12:12 ` Pavel Machek
2019-06-09 13:55 ` Daniel Lezcano
2019-06-09 14:13 ` Zhang Rui
2019-06-11 10:12 ` Pavel Machek
2019-06-11 10:15 ` Viresh Kumar
2019-06-12 2:37 ` Doug Smythies
2019-06-12 21:44 ` Rafael J. Wysocki [this message]
2019-06-12 23:39 ` Doug Smythies
2019-06-13 8:11 ` Pavel Machek
2019-06-13 9:00 ` Rafael J. Wysocki
2019-06-13 8:52 ` Rafael J. Wysocki
2019-06-18 8:20 ` Doug Smythies
2019-06-18 8:34 ` Pavel Machek
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