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

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Date:   Tue, 11 Jun 2019 12:12:13 +0200
From:   Pavel Machek <pavel@....cz>
To:     Zhang Rui <rui.zhang@...el.com>, daniel.lezcano@...aro.org
Cc:     kernel list <linux-kernel@...r.kernel.org>,
        linux-acpi@...r.kernel.org, rjw@...ysocki.net,
        viresh.kumar@...aro.org, linux-pm@...r.kernel.org,
        tglx@...utronix.de, mingo@...hat.com, bp@...en8.de, hpa@...or.com,
        x86@...nel.org
Subject: Re: 5.2-rc2: low framerate in flightgear, cpu not running at full
 speed, thermal related?

Hi!

I'm trying to provide all the required info below. Any ideas?

> > > > The CPU is Intel(R) Core(TM) i5-2520M CPU @ 2.50GHz . I guess it
> > > > means
> > > > it should be able to sustain both cores running at 2.5GHz?
> > > > 
> > > > Any ideas? Were there any recent changes in that area?
> > > I tried kernel compile. It keeps both cores at 3GHz, temperature
> > > goes
> > > up over 95C, and then cpus start going down to 2.3GHz... and then
> > > down
> > > to 2GHz... and down to 1.9GHz.

> what temperature does coretemp report?
> can you please provide the sensors output in 4.6 during kernel
> compiling?
> 
> can you attach the output of "grep . /sys/class/thermal/thermal*/*"
> when the temperature goes high in both kernels?

v5.2:
bash -c sensors;  cat /proc/cpuinfo

thinkpad-isa-0000
Adapter: ISA adapter
fan1:        4493 RPM

coretemp-isa-0000
Adapter: ISA adapter
Package id 0:  +97.0°C  (high = +86.0°C, crit = +100.0°C)
Core 0:        +97.0°C  (high = +86.0°C, crit = +100.0°C)
Core 1:        +94.0°C  (high = +86.0°C, crit = +100.0°C)

cpu MHz         : 2351.857
cpu MHz         : 2351.920
cpu MHz         : 2351.980
cpu MHz         : 2352.036
pavel@duo:~$ cat /sys/devices/system/cpu/*/cpufreq/scaling_governor
powersave
powersave
powersave
powersave
pavel@duo:~$ grep . /sys/class/thermal/thermal*/* 2> /dev/null
/sys/class/thermal/thermal_zone0/available_policies:step_wise
/sys/class/thermal/thermal_zone0/mode:enabled
/sys/class/thermal/thermal_zone0/passive:0
/sys/class/thermal/thermal_zone0/policy:step_wise
/sys/class/thermal/thermal_zone0/temp:96000
/sys/class/thermal/thermal_zone0/trip_point_0_temp:99000
/sys/class/thermal/thermal_zone0/trip_point_0_type:critical
/sys/class/thermal/thermal_zone0/type:acpitz
pavel@duo:~$

v4.6:

acpitz-virtual-0
Adapter: Virtual device
temp1:        +96.0°C  (crit = +99.0°C)

coretemp-isa-0000
Adapter: ISA adapter
Physical id 0:  +97.0°C  (high = +86.0°C, crit = +100.0°C)
Core 0:         +97.0°C  (high = +86.0°C, crit = +100.0°C)
Core 1:         +94.0°C  (high = +86.0°C, crit = +100.0°C)

thinkpad-isa-0000
Adapter: ISA adapter
fan1:        4493 RPM

cpu MHz         : 2501.000
cpu MHz         : 2501.000
cpu MHz         : 2501.000
cpu MHz         : 2501.000

pavel@duo:~$ cat /sys/devices/system/cpu/*/cpufreq/scaling_governor
ondemand
ondemand
ondemand
ondemand

pavel@duo:~$ grep . /sys/class/thermal/thermal*/* 2> /dev/null
/sys/class/thermal/thermal_zone0/available_policies:step_wise
/sys/class/thermal/thermal_zone0/mode:enabled
/sys/class/thermal/thermal_zone0/passive:0
/sys/class/thermal/thermal_zone0/policy:step_wise
/sys/class/thermal/thermal_zone0/temp:96000
/sys/class/thermal/thermal_zone0/trip_point_0_temp:99000
/sys/class/thermal/thermal_zone0/trip_point_0_type:critical
/sys/class/thermal/thermal_zone0/type:acpitz
pavel@duo:~$

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

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