linux-kernel - Re: Regression in 4.8 - CPU speed set very low

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Date:   Mon, 26 Sep 2016 18:53:53 -0500
From:   Larry Finger <Larry.Finger@...inger.net>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux PM list <linux-pm@...r.kernel.org>,
        Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
Subject: Re: Regression in 4.8 - CPU speed set very low

On 09/26/2016 05:16 PM, Rafael J. Wysocki wrote:
>On Tue, Sep 27, 2016 at 12:09 AM, Larry Finger
<Larry.Finger@...inger.net> wrote:
>
> Maybe it's better to try diagnose the problem instead of spending more
> time on bisection.

In my original post, I asked for such help, but nothing until today. I had no 
idea what to check, but now I have a better idea.

> I'd like to know whether or not 4.7 was definitely good, though.

I never saw this problem with 4.7, but given the difficulty in triggering the 
problem, my tests may not have been definitive.
>
>> If it is one of them, it may be a while before I dare call this one "good".
>> In one respect, that is good as I will be traveling tomorrow and Wednesday.
>
> What does "cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_driver" say?

intel_pstate

Larry