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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <e42f36f7-5bf4-fdc4-12a7-a2d6a645e82e@lwfinger.net>
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