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Old 2nd December 2010, 04:16 PM
hiberphoptik Offline
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p4-clockmod vs. acpi-cpufreq

OK so I am looking at my /var/log/messages because of something else but I keep seeing this:

p4-clockmod: Warning: EST-capable CPU detected. The acpi-cpufreq module offers voltage scaling in addition of frequency scaling. You should use that instead of p4-clockmod, if possible.

ooookayyyy so apparently I should use acpi-cpufreq instead of p4-clockmod? how do I do that? seems like this is something built in to my kernel so I'm not sure how to just "change" from one to the other


any ideas?
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  #2  
Old 2nd December 2010, 06:13 PM
PabloTwo Offline
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Re: p4-clockmod vs. acpi-cpufreq

They are both loadable/un-loadable kernel modules:
Code:
BASH:~/-> locate p4-clockmod
/lib/modules/2.6.32.21-166.fc12.i686/kernel/arch/x86/kernel/cpu/cpufreq/p4-clockmod.ko
/lib/modules/2.6.32.21-168.fc12.i686/kernel/arch/x86/kernel/cpu/cpufreq/p4-clockmod.ko
/lib/modules/2.6.32.23-170.fc12.i686/kernel/arch/x86/kernel/cpu/cpufreq/p4-clockmod.ko
BASH:~/-> locate acpi-cpufreq
/lib/modules/2.6.32.21-166.fc12.i686/kernel/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.ko
/lib/modules/2.6.32.21-168.fc12.i686/kernel/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.ko
/lib/modules/2.6.32.23-170.fc12.i686/kernel/arch/x86/kernel/cpu/cpufreq/acpi-cpufreq.ko
You could:
Code:
modprobe -r p4-clockmod
modprobe acpi-cpufreq
The first command unloads the p4-clockmod module and the second loads the acpi-cpufreq module.
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Old 2nd December 2010, 07:03 PM
hiberphoptik Offline
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Re: p4-clockmod vs. acpi-cpufreq

does doing this stick across reboots or should i script this?

thanks!
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Old 2nd December 2010, 07:10 PM
PabloTwo Offline
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Re: p4-clockmod vs. acpi-cpufreq

No, that won't stick across reboots. For that, you could either put both of those commands in the /etc/rc.d/rc.local file, or, better yet:

1) blacklist the p4-clockmod module by creating the file: /etc/modprobe.d/blacklist-p4-clockmod.conf
and put into that file just one line: blacklist p4-clockmod

2) put just the "modprobe acpi-cupfreq" line into the /etc/rc.d/rc.local file.

The two step method is better in that the p4-clockmod module won't load in the first place, so then no need to unload it.
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  #5  
Old 2nd December 2010, 07:18 PM
hiberphoptik Offline
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Re: p4-clockmod vs. acpi-cpufreq

excellent! thanks for the info
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