CPU Freq scaling
in [Linux Hardware]
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From: Whoever on 6 Apr 2007 02:25 I have an NFORCE3 based motherboard and an Athlon64 3000+ CPU. I can't seem to get frequency scaling to work -- the appropriate pseudo files do not exist in /sys: # ls /sys/devices/system/cpu/cpu0/ cache topology I would expect to see also a "cpufreq" dirctory at that level. I think I have everything enabled in my kernel config: zcat /proc/config.gz | grep CPU_FREQ CONFIG_CPU_FREQ=y CONFIG_CPU_FREQ_TABLE=y # CONFIG_CPU_FREQ_DEBUG is not set CONFIG_CPU_FREQ_STAT=y # CONFIG_CPU_FREQ_STAT_DETAILS is not set # CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE is not set CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE=y CONFIG_CPU_FREQ_GOV_PERFORMANCE=y CONFIG_CPU_FREQ_GOV_POWERSAVE=y CONFIG_CPU_FREQ_GOV_USERSPACE=y CONFIG_CPU_FREQ_GOV_ONDEMAND=y CONFIG_CPU_FREQ_GOV_CONSERVATIVE=y What have I missed?
From: Whoever on 6 Apr 2007 02:28 On Thu, 5 Apr 2007, Whoever wrote: > I have an NFORCE3 based motherboard and an Athlon64 3000+ CPU. > > I can't seem to get frequency scaling to work -- the appropriate pseudo files > do not exist in /sys: > > # ls /sys/devices/system/cpu/cpu0/ > cache topology > > I would expect to see also a "cpufreq" dirctory at that level. > > I think I have everything enabled in my kernel config: > > zcat /proc/config.gz | grep CPU_FREQ > CONFIG_CPU_FREQ=y > CONFIG_CPU_FREQ_TABLE=y > # CONFIG_CPU_FREQ_DEBUG is not set > CONFIG_CPU_FREQ_STAT=y > # CONFIG_CPU_FREQ_STAT_DETAILS is not set > # CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE is not set > CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE=y > CONFIG_CPU_FREQ_GOV_PERFORMANCE=y > CONFIG_CPU_FREQ_GOV_POWERSAVE=y > CONFIG_CPU_FREQ_GOV_USERSPACE=y > CONFIG_CPU_FREQ_GOV_ONDEMAND=y > CONFIG_CPU_FREQ_GOV_CONSERVATIVE=y > > What have I missed? > I have more info: dmesg | grep power powernow-k8: Found 1 AMD Athlon(tm) 64 Processor 3000+ processors (version 2.00.00) powernow-k8: BIOS error - no PSB or ACPI _PSS objects Does this mean that the BIOS doesn't support cpu freq scaling?
From: Anton Ertl on 6 Apr 2007 08:29 Whoever <nobody(a)devnull.none> writes: >powernow-k8: BIOS error - no PSB or ACPI _PSS objects > >Does this mean that the BIOS doesn't support cpu freq scaling? Maybe. Or you have not enabled it in the BIOS setup. - anton -- M. Anton Ertl Some things have to be seen to be believed anton(a)mips.complang.tuwien.ac.at Most things have to be believed to be seen http://www.complang.tuwien.ac.at/anton/home.html
From: AZ Nomad on 6 Apr 2007 10:29 On Fri, 06 Apr 2007 12:29:01 GMT, Anton Ertl <anton(a)mips.complang.tuwien.ac.at> wrote: >Whoever <nobody(a)devnull.none> writes: >>powernow-k8: BIOS error - no PSB or ACPI _PSS objects >> >>Does this mean that the BIOS doesn't support cpu freq scaling? >Maybe. Or you have not enabled it in the BIOS setup. I don't think the BIOS has anything to do with it. You have to have a cpu and chipset that support it and build a kernel with it. I'm using: # # CPU Frequency scaling # CONFIG_CPU_FREQ=y CONFIG_CPU_FREQ_TABLE=y # CONFIG_CPU_FREQ_DEBUG is not set CONFIG_CPU_FREQ_STAT=y # CONFIG_CPU_FREQ_STAT_DETAILS is not set CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE=y # CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE is not set CONFIG_CPU_FREQ_GOV_PERFORMANCE=y # CONFIG_CPU_FREQ_GOV_POWERSAVE is not set CONFIG_CPU_FREQ_GOV_USERSPACE=y CONFIG_CPU_FREQ_GOV_ONDEMAND=y # CONFIG_CPU_FREQ_GOV_CONSERVATIVE is not set and, of course, I've built cpufreqd and cpufrequtils
From: Anton Ertl on 6 Apr 2007 17:38 AZ Nomad <aznomad.2(a)PremoveOBthisOX.COM> writes: >On Fri, 06 Apr 2007 12:29:01 GMT, Anton Ertl <anton(a)mips.complang.tuwien.ac.at> wrote: > > >>Whoever <nobody(a)devnull.none> writes: >>>powernow-k8: BIOS error - no PSB or ACPI _PSS objects >>> >>>Does this mean that the BIOS doesn't support cpu freq scaling? > >>Maybe. Or you have not enabled it in the BIOS setup. > >I don't think the BIOS has anything to do with it. You have to have a cpu and >chipset that support it and build a kernel with it. And you have to enable Cool'n'Quiet in the BIOS setting, or your fine CPU and kernel just won't do it. >and, of course, I've built cpufreqd and cpufrequtils These, OTOH, are unnecessary (unless you want to play games with the userspace governor). - anton -- M. Anton Ertl Some things have to be seen to be believed anton(a)mips.complang.tuwien.ac.at Most things have to be believed to be seen http://www.complang.tuwien.ac.at/anton/home.html
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