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* [Bug 51741] New: powernow-k8 calls for acpi-cpufreq but doesn’t warn if it’s not available
@ 2012-12-16 16:03 bugzilla-daemon
  2012-12-16 16:13 ` [Bug 51741] " bugzilla-daemon
                   ` (4 more replies)
  0 siblings, 5 replies; 6+ messages in thread
From: bugzilla-daemon @ 2012-12-16 16:03 UTC (permalink / raw)
  To: cpufreq

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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^ permalink raw reply	[flat|nested] 6+ messages in thread
end of thread, other threads:[~2013-02-12 20:12 UTC | newest]

Thread overview: 6+ messages (download: mbox.gz follow: Atom feed
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2012-12-16 16:03 [Bug 51741] New: powernow-k8 calls for acpi-cpufreq but doesn’t warn if it’s not available bugzilla-daemon
2012-12-16 16:13 ` [Bug 51741] " 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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