From: bugzilla-daemon@bugzilla.kernel.org
To: cpufreq@vger.kernel.org
Subject: [Bug 64251] New: Intel Pstate driver minimum percent does not change with turbo off
Date: Sat, 02 Nov 2013 21:42:47 +0000 [thread overview]
Message-ID: <bug-64251-12968@https.bugzilla.kernel.org/> (raw)
https://bugzilla.kernel.org/show_bug.cgi?id=64251
Bug ID: 64251
Summary: Intel Pstate driver minimum percent does not change
with turbo off
Product: Power Management
Version: 2.5
Kernel Version: 3.12rc7
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: cpufreq
Assignee: cpufreq@vger.kernel.org
Reporter: dsmythies@telus.net
Regression: No
Created attachment 113141
--> https://bugzilla.kernel.org/attachment.cgi?id=113141&action=edit
Frequency Vs. Requested Frequency
When turbo is turned off the maximum frequency percent does not change. O.K.
So the minimum frequency percent should change, but it doesn't.
Using my computer as an example: The turbo on maximum frequency is 3.8 GHz; The
turbo off maximum frequency is 3.4 GHz; The minimum frequency is 1.6 GHz.
Therefore we would expect: For turbo on, max percent = 100, min percent = 42;
For turbo off, max percent = 100, min percent = 47.
starting from a fresh boot:
doug@s15:~$ uname -a
Linux s15 3.12.0-rc7+ #48 SMP Fri Nov 1 21:09:51 PDT 2013 x86_64 x86_64 x86_64
GNU/Linux
doug@s15:~$ cat /sys/devices/system/cpu/intel_pstate/*
100
42
0
doug@s15:~$ cd temp
doug@s15:~/temp$ sudo ./set_cpu_turbo_off
[sudo] password for doug:
doug@s15:~/temp$ cat /sys/devices/system/cpu/intel_pstate/*
100
42
1
doug@s15:~/temp$ cat set_cpu_turbo_off
#! /bin/bash
echo "1" > /sys/devices/system/cpu/intel_pstate/no_turbo
The attached png file demonstrates. (the rounding part will be a separate bug
report)
Note: This bug is extracted from bug 59481 which mentioned several issues, the
main issue was solved and the bug closed. Now I am following up on the other
issues.
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next reply other threads:[~2013-11-02 21:42 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-02 21:42 bugzilla-daemon [this message]
2013-11-04 16:35 ` [Bug 64251] Intel Pstate driver minimum percent does not change with turbo off bugzilla-daemon
2013-11-05 7:31 ` bugzilla-daemon
2013-11-05 7:56 ` bugzilla-daemon
2013-11-07 5:28 ` bugzilla-daemon
2013-11-07 5:36 ` bugzilla-daemon
2014-04-18 3:01 ` bugzilla-daemon
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