linux-kernel - Re: v4.8-rc1: thinkpad x60: running at low frequency even during kernel build

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Date:   Fri, 4 Nov 2016 14:05:20 +0000
From:   "Pandruvada, Srinivas" <srinivas.pandruvada@...el.com>
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "pavel@....cz" <pavel@....cz>,
        "viresh.kumar@...aro.org" <viresh.kumar@...aro.org>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "rjw@...ysocki.net" <rjw@...ysocki.net>
CC:     "Zhang, Rui" <rui.zhang@...el.com>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>
Subject: Re: v4.8-rc1: thinkpad x60: running at low frequency even during
 kernel build

On Fri, 2016-11-04 at 09:58 +0100, Pavel Machek wrote:
> On Fri 2016-11-04 09:38:49, Pavel Machek wrote:
> > 
> > 

[...]

> > What is worse, they go to low frequency even with "performance"
> governor on v4.8-rc1?!
> 
> pavel@duo:/sys/devices/system/cpu/cpu0/cpufreq$ sudo cat
> /sys/devices/system/cpu/cpu*/cpufreq/cpuinfo_cur_freq ; sudo cat
> /sys/devices/system/cpu/cpu*/cpufreq/cpuinfo_cur_freq  ; sudo cat
> /sys/devices/system/cpu/cpu*/cpufreq/cpuinfo_cur_freq ; sudo cat
> /sys/devices/system/cpu/cpu*/cpufreq/cpuinfo_cur_freq  ; sudo cat
> /sys/devices/system/cpu/cpu*/cpufreq/cpuinfo_cur_freq  ; sudo cat
> /sys/devices/system/cpu/cpu*/cpufreq/cpuinfo_cur_freq
> 1000000
> 1000000
> 1000000
> 1000000
> 1833000
> 1833000
> 1000000
> 1000000
> 1833000
> 1833000
> 1000000
> 1000000
> pavel@duo:/sys/devices/system/cpu/cpu0/cpufreq$ grep -i
> . /sys/devices/system/cpu/cpu0/cpufreq/*
> /sys/devices/system/cpu/cpu0/cpufreq/affected_cpus:0
> /sys/devices/system/cpu/cpu0/cpufreq/bios_limit:1000000

You are having thermal issue, so the BIOS is forcing to lowest possible
freq. Just for a test only, boot by adding to your kernel command line
during boot 
processor.ignore_ppc=1 



> grep: /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq:
> Permission denied
> /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq:1833000
> /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_min_freq:1000000
> /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_transition_latency:10000
> /sys/devices/system/cpu/cpu0/cpufreq/freqdomain_cpus:0 1
> /sys/devices/system/cpu/cpu0/cpufreq/related_cpus:0
> /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_frequencies:18
> 33000
> 1333000 1000000
> /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors:cons
> ervative
> powersave schedutil ondemand performance
> /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq:1000000
> /sys/devices/system/cpu/cpu0/cpufreq/scaling_driver:acpi-cpufreq
> /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor:performance
> /sys/devices/system/cpu/cpu0/cpufreq/scaling_max_freq:1000000
> /sys/devices/system/cpu/cpu0/cpufreq/scaling_min_freq:1000000
> /sys/devices/system/cpu/cpu0/cpufreq/scaling_setspeed:<unsupported>
> grep: /sys/devices/system/cpu/cpu0/cpufreq/stats: Is a directory
> pavel@duo:/sys/devices/system/cpu/cpu0/cpufreq$
> 

> Let me try v4.9-rc2... that works ok (cpus at the high frequency
> during the kernel build). Unfortunately that sends my cpus to 99C
> temperature range (and eventually forces emergency shutdown).

This we have to debug. Do you see same line like 
"
/sys/devices/system/cpu/cpu0/cpufreq/bios_limit:1000000
"
If not we need
to find out why.

I suggest enter kernel bugzilla. I will add couple of more suggestion to debug.


Thanks,
Srinivas