On 09/06/2019 14:12, Pavel Machek wrote: > Hi! > >>> When I start flightgear, I get framerates around 20 fps and cpu at >>> 3GHz: >>> >>> pavel@duo:~/bt$ cat /proc/cpuinfo | grep MHz >>> cpu MHz : 3027.471 >>> cpu MHz : 2981.863 >>> cpu MHz : 2958.352 >>> cpu MHz : 2864.001 >>> pavel@duo:~/bt$ >>> >>> (Ok, fgfs is really only running at single core, so why do both cores >>> run at 3GHz?) >>> >>> But temperatures get quite high: >>> >>> pavel@duo:~/bt$ sensors >>> thinkpad-isa-0000 >>> Adapter: ISA adapter >>> fan1: 4485 RPM >>> >>> coretemp-isa-0000 >>> Adapter: ISA adapter >>> Package id 0: +98.0°C (high = +86.0°C, crit = +100.0°C) >>> Core 0: +98.0°C (high = +86.0°C, crit = +100.0°C) >>> Core 1: +91.0°C (high = +86.0°C, crit = +100.0°C) >>> >>> And soon cpu goes to 1.5GHz range, with framerates going down to >>> 12fps. That's a bit low. >>> >>> Room temperature is 26Celsius. >>> >>> 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. >> >> watch bash -c 'sensors; cat /proc/cpuinfo | grep MHz' > > Situation is very different with v4.6 distro based kernel. > > CPU MHz is only getting values round to 100MHz. It does not go above > 2.5GHz, but it does not go below 2.5GHz under the load, either. > > ACPI adapter appears in sensors output. > > Now I tried going to 5.2-rc4. It behaves the same as 5.2-rc2. Goes up > to 3GHz briefly but then down to 2.0GHz and below under load. > > Ideas welcome. What is the cpufreq governor for v4.6 and v5.2-rc4? -- <http://www.linaro.org/> Linaro.org │ Open source software for ARM SoCs Follow Linaro: <http://www.facebook.com/pages/Linaro> Facebook | <http://twitter.com/#!/linaroorg> Twitter | <http://www.linaro.org/linaro-blog/> Blog
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