[Bug 29522] New: Unable to use any kind of frequency scaling

[Bug 29522] New: Unable to use any kind of frequency scaling

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=29522

           Summary: Unable to use any kind of frequency scaling
           Product: Power Management
           Version: 2.5
    Kernel Version: 2.6.38-rc5
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: cpufreq
        AssignedTo: cpufreq@vger.kernel.org
        ReportedBy: rbrito@ime.usp.br
        Regression: No


Hi.

I have a Pentium D 805 with a Gigabyte motherboard that is only able to reduce
its speed with p4-clockmod and with the userspace governor (with the help of
the powernowd daemon controlling it), not with the ondemand/conservative (since
these modules say---correctly---that the latency is too high for them).

Since I see that p4-clockmod is frowned upon, I would like to get this fixed.

Is there anything that I could help with so that this could get fixed?


Thanks,

Rogério Brito.


P.S.: Right now, I am compiling a new kernel (from Linus git tree, up-to-date)
with the following change, just to see its behaviour:

--- a/arch/x86/kernel/cpu/cpufreq/p4-clockmod.c
+++ b/arch/x86/kernel/cpu/cpufreq/p4-clockmod.c
@@ -244,7 +244,7 @@ static int cpufreq_p4_cpu_init(struct cpufreq_policy
*policy)

        /* the transition latency is set to be 1 higher than the maximum
         * transition latency of the ondemand governor */
-       policy->cpuinfo.transition_latency = 10000001;
+       policy->cpuinfo.transition_latency = 100000;
        policy->cur = stock_freq;

        return cpufreq_frequency_table_cpuinfo(policy, &p4clockmod_table[0]);

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[Bug 29522] Unable to use any kind of frequency scaling

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=29522





--- Comment #1 from Rogério Brito <rbrito@ime.usp.br>  2011-02-20 10:48:12 ---
Hi there.

Just as an extra data point, with the patch that I sent in the earlier package,
I can indeed (as expected) set lower frequencies with ondemand (that is, *it*
sets the frequency dynamically).

One benefit of this is that, when my computer is left idle, it does not heat as
much as it used to, but I fear that there is no voltage being decreased, and,
therefore, no power economy.

Is that right? How should one implement it "the right way"? I just know some C,
but I don't know how program physical devices. I can, OTOH, test as many
patches as you'd like me to.


Thanks in advance for any help, Rogério Brito.

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[Bug 29522] Unable to use any kind of frequency scaling

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https://bugzilla.kernel.org/show_bug.cgi?id=29522





--- Comment #2 from Rogério Brito <rbrito@ime.usp.br>  2011-02-20 10:50:29 ---
Oh, and I can provide as many details from this computer as is feasible. It is
currently my main workstation and development box.

I may not have access to it during vacations and travels, though.


Thanks again,
Rogério Brito.

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[Bug 29522] Unable to use any kind of frequency scaling

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=29522


Zhang Rui <rui.zhang@intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO
                 CC|                            |rui.zhang@intel.com




--- Comment #3 from Zhang Rui <rui.zhang@intel.com>  2012-01-18 03:15:02 ---
It's great that the kernel bugzilla is back.

Can you please verify if the problem still exists in the latest upstream
kernel?

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[Bug 29522] Unable to use any kind of frequency scaling

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=29522


Alan <alan@lxorguk.ukuu.org.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |alan@lxorguk.ukuu.org.uk
         AssignedTo|cpufreq@vger.kernel.org     |rjw@sisk.pl




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