On Tuesday 10 May 2011 19:05:08 Mark Knecht wrote: > On Tue, May 10, 2011 at 9:38 AM, Bill Longman <bill.long...@gmail.com> wrote: > > On 05/10/2011 09:34 AM, James wrote: > >> Alan McKinnon <alan.mckinnon <at> gmail.com> writes: > >>> otherwise. Just enable ondemand, disable everything else, and et the > >>> kernel > >> > >>> get on with doing what it does best: > >> So this is what you are saying? > >> > >> > >> [*] CPU Frequency scaling │ │ > >> │ │ [*] Enable CPUfreq debugging │ │ > >> │ │ <*> CPU frequency translation statistics │ │ > >> │ │ [ ] CPU frequency translation statistics details │ │ > >> │ │ Default CPUFreq governor (performance) ---> │ │ > >> │ │ -*- 'performance' governor │ │ > >> │ │ < > 'powersave' governor │ │ > >> │ │ < > 'userspace' governor for userspace frequency scaling│ │ > >> │ │ <*> 'ondemand' cpufreq policy governor │ │ > >> │ │ < > 'conservative' cpufreq governor │ │ > >> │ │ *** CPUFreq processor drivers *** │ │ > >> │ │ < > Processor Clocking Control interface driver │ │ > >> │ │ <*> ACPI Processor P-States driver │ │ > >> │ │ < > AMD Opteron/Athlon64 PowerNow! │ │ > >> │ │ < > Intel Enhanced SpeedStep (deprecated) │ │ > >> │ │ < > Intel Pentium 4 clock modulation > > > > Yes but no. Yes, those are the correct choices, but the default governor > > should be ondemand. > > Or in the case of the OP who is brave enough (or silly enough?) to > risk the long term reliability of his CPU running it with no fan, > possibly choose powersave with a specific low clock rate as the > default and then switch to either ondemand or conservative manually > when he needs more performance. In a machine such as he's playing with > I wonder if he really wants ondemand (jumps to max and then slows down > over time) vs conservative which more slowly ramps up the clock rate > if the job at hand takes more time. > > It's all a trade off of performance vs power & heat. > > On my 12 thread server I've played with these two and frankly don't > see a lot of difference doing any large job. They are both a bot > slower than running performance, but I save a lot of power (and over > time money) using them so I'm happy.
I just checked on a Pentium 4 32bit box and I couldn't find any declaration about cpufreq under /sys/devices/system/cpu/cpu0/ I have enabled ondemand since I first built a kernel for that machine, but it seems to have been pegged at 3.4GHz even when the plasma thingy shows minimum CPU load. grep MHz /proc/cpuinfo cpu MHz : 3401.054 cpu MHz : 3401.054 ls -la /sys/devices/system/cpu/cpu0/ total 0 drwxr-xr-x 6 root root 0 May 10 18:51 . drwxr-xr-x 6 root root 0 May 10 18:51 .. drwxr-xr-x 4 root root 0 May 10 21:04 cache drwxr-xr-x 2 root root 0 May 10 21:04 microcode drwxr-xr-x 2 root root 0 May 10 21:04 thermal_throttle drwxr-xr-x 2 root root 0 May 10 21:04 topology cat /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 15 model : 3 model name : Intel(R) Pentium(R) 4 CPU 3.40GHz stepping : 4 cpu MHz : 3401.054 cache size : 1024 KB physical id : 0 siblings : 2 core id : 0 cpu cores : 1 apicid : 0 initial apicid : 0 fdiv_bug : no hlt_bug : no f00f_bug : no coma_bug : no fpu : yes fpu_exception : yes cpuid level : 5 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe constant_tsc pebs bts pni dtes64 monitor ds_cpl cid xtpr bogomips : 6802.10 clflush size : 64 cache_alignment : 128 address sizes : 36 bits physical, 32 bits virtual power management: Same with the other virtual core, "power management" is blank. Am I missing something in my kernel or is my MoBo/CPU feature poor? cat .config | 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=y # CONFIG_CPU_FREQ_DEFAULT_GOV_PERFORMANCE is not set # CONFIG_CPU_FREQ_DEFAULT_GOV_USERSPACE is not set CONFIG_CPU_FREQ_DEFAULT_GOV_ONDEMAND=y # CONFIG_CPU_FREQ_DEFAULT_GOV_CONSERVATIVE 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 -- Regards, Mick
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