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

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Message-ID: <20161105135313.GB3933@amd>
Date:   Sat, 5 Nov 2016 14:53:13 +0100
From:   Pavel Machek <pavel@....cz>
To:     "Pandruvada, Srinivas" <srinivas.pandruvada@...el.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Zhang, Rui" <rui.zhang@...el.com>,
        "linux-pm@...r.kernel.org" <linux-pm@...r.kernel.org>,
        "platform-driver-x86@...r.kernel.org" 
        <platform-driver-x86@...r.kernel.org>,
        "rjw@...ysocki.net" <rjw@...ysocki.net>,
        "viresh.kumar@...aro.org" <viresh.kumar@...aro.org>,
        "ibm-acpi-devel@...ts.sourceforge.net" 
        <ibm-acpi-devel@...ts.sourceforge.net>,
        "ibm-acpi@....eng.br" <ibm-acpi@....eng.br>,
        "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

Hi!

> > Ok, can do, let me recompile and reboot.
> > 
> > > 
> > > When temperature limit is reached acpi_processor_ppc_notifier()
> > > should
> > > be called.
> > 
> > No, that's not correct for ACPI passive trip points, is it? If I
> > recall correctly, those should be monitored even when temperature is
> > below them so that it does not reach them...?
> No if BIOS is sending PPC, it will be called. You can try first in 4.8.
> 
> Also try
> 
> Don't run workload, just on an idle system.
> 
> # echo 1 > /sys/class/thermal/cooling_device2/cur_state
> monitor the scaling_max_freq, it should reduce
> 
> # echo 2 > /sys/class/thermal/cooling_device2/cur_state
> monitor the scaling_max_freq, it should reduce

Yes, this seems to work. scaling_max goes to 1.5, then 1.1. Also under
load, scaling_max_freq changes. But at that point, we are already
around 98C... and bios_limit stays the same all the time in v4.9.

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

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