Hello, I'm using Ubuntu 12.04 and I noticed a strange behaviour when I compile a kernel from sou rce. I tried kernel 3.3.7 and made a make oldconfig of my stock kernel from ubuntu and defaulted all the new options, so I was guarateeing that all th e configs of the stock kernel were being imported to the newly compiled and that scaling would work as it should. The problem is the scaling frequency reported by cpuinfo_cur_freq and scaling_cur_freq as shown below, I compar ed those from compiled and stock kernels. What am I missing? Or it's a kind of bug? /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cp u family : 6 model : 42 model name : Intel( R) Core(TM) i7-2670QM CPU @ 2.20GHz stepping : 7 microco de : 0C39723 cpu MHz : 800.000 cache size : 6144 KB physical id : 0 siblings : 8 core id : 0 cpu cores : 4 apicid : 0 init ial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 13 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 syscall nx rdtscp lm co nstant_tsc arch_perfmon pebs bts nopl xtopology nonstop_tsc aperfmperf p ni pclmulqdq dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm pcid sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx lahf_lm id a arat epb xsaveopt pln pts dts tpr_shadow vnmi flexpriority ept vpidbogomips : 4390.25 clflush size : 64 cache_alignm ent : 64 address sizes : 36 bits physical, 48 bits virtual po wer management: WITH COMPILED KERNEL: What I detected is this. I have two different readings for the same pro cessor but one comes from cpuinfo_cur_freq and the other one comes from scaling_cur_freq as seen below: sudo cat scaling_cur_freq; sud o cat cpuinfo_cur_freq 800000 1800000 What's the true reading? Why with stock kernel it doesn't happen the frequencies match! cat scaling_driver; cat scaling_governor acpi-cpufreq ondemand cat time_in_state 2201000 57624 2200000 2875 2 000000 2297 1900000 631 1800000 620 1700000 709 160 0000 659 1500000 789 1400000 793 1300000 822 120000 0 801 1100000 977 1000000 1142 900000 705 800000 84 2189 WITH STOCK KERNEL: With stock kernel, just for comparison, as you can see it's more logical a nd the readings match, even the one that shows the time_in_state. sudo cat scaling_cur_freq; sudo cat cpuinfo_cur_freq 800000 800000 cat scaling_driver; cat scaling_governor acpi-cpufreq ondemand cat time_in_state 2201000 22259 2200000 50 200000 0 28 1900000 57 1800000 42 1700000 53 1600000 551500000 112 1400000 241 1300000 280 1200000 355 1100000 296 1000000 403 900000 1642 800000 145615 Leandro Scott -- To unsubscribe from this list: send the line "unsubscribe cpufreq" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
