From: bugzilla-daemon@bugzilla.kernel.org
To: cpufreq@vger.kernel.org
Subject: [Bug 51741] New: powernow-k8 calls for acpi-cpufreq but doesn’t warn if it’s not available
Date: Sun, 16 Dec 2012 16:03:47 +0000 (UTC) [thread overview]
Message-ID: <bug-51741-12968@https.bugzilla.kernel.org/> (raw)
https://bugzilla.kernel.org/show_bug.cgi?id=51741
Summary: powernow-k8 calls for acpi-cpufreq but doesn’t warn if
it’s not available
Product: Power Management
Version: 2.5
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: cpufreq
AssignedTo: cpufreq@vger.kernel.org
ReportedBy: linuxuser330250@gmx.net
Regression: No
On my system, I used to have powernow-k8 compiled into the kernel, but not
acpi-cpufreq. I run Gentoo Linux.
With sys-kernel/gentoo-sources-3.6.8, I got the following relevent dmesg
output:
powernow-k8: Found 1 AMD Phenom(tm) II X6 1090T Processor (6 cpu cores)
(version 2.20.00)
powernow-k8: Core Performance Boosting: on.
powernow-k8: 0 : pstate 0 (3200 MHz)
powernow-k8: 1 : pstate 1 (2400 MHz)
powernow-k8: 2 : pstate 2 (1600 MHz)
powernow-k8: 3 : pstate 3 (800 MHz)
Now, with sys-kernel/gentoo-sources-3.7.0, dmesg showed the following:
powernow-k8: this CPU is not supported anymore, using acpi-cpufreq instead.
This lead me into thinking that acpi-cpufreq was used when it actually wasn’t,
because it was missing in my kernel (since I don’t know all config options by
heart: I had to check for that).
I found that the fans were a bit noisier than normal, so I looked in
/proc/cpuinfo, which showed all 6 cores were at 3.2 GHz.
I then recompiled the kernel with acpi-cpufreq compiled in and removed
powernow-k8. Now /proc/cpuinfo shows 800 MHz on all or most of the cores when
the system is mostly idle.
Apparently, acpi-cpufreq doesn’t show any output at all, except:
acpi-cpufreq: overriding BIOS provided _PSD data
My suggestion would be to make powernow-k8 check for the availability of
acpi-cpufreq and print out a warning should it not be available.
And I also suggest a short “acpi-cpufreq is used for frequency scaling” so one
can see that it was loaded alright.
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next reply other threads:[~2012-12-16 16:03 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-12-16 16:03 bugzilla-daemon [this message]
2012-12-16 16:13 ` [Bug 51741] powernow-k8 calls for acpi-cpufreq but doesn’t warn if it’s not available bugzilla-daemon
2013-01-24 22:18 ` bugzilla-daemon
2013-01-26 10:50 ` bugzilla-daemon
2013-02-08 18:32 ` bugzilla-daemon
2013-02-12 20:12 ` bugzilla-daemon
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