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