But if I use userspace governor, I run two endless loop. The top show two cpus are busy. That's right.
But Powertop 1.97 (frequency stats)shows only one cpu run at the highest frequency. The other is 100% idle. One reason maybe powertop update interval(too long 20 sec? I don't find any interval tunning.). Besides powertop read info from /sys, Linux OS can't export right info, so powertop can't ensure either. Right ? The problem is that you set speed 2Ghz to core1 , 3Ghz to Core2, the final result is 3Ghz for both results, software can't see it. wkq At 2011-01-23 19:13:21，"Arjan van de Ven" <ar...@linux.intel.com> wrote: >On 1/23/2011 4:40 PM, wkq5325 wrote: >> >> Hi, >> >> From “ondemand” governor source code, you can find its cpu frequency >> scaling is for each CPU. OK, now, for multi-core, it should means >> unified freq(max freq) for multi-cores ? or varied freq for each core? >> >> We all know many intel platform only support freq/voltage scaling for >> CPU, not every cores. So, in Linux /sys, it means the cpufreq doesn't >> show real freq for each core? >> >> Does anybody know the issue ? >> > >yep this is very well known. > >if you use powertop 2.0 beta it'll calculate the actual behavior ... > > >
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