https://bugzilla.kernel.org/show_bug.cgi?id=19702 --- Comment #38 from vyncere <vyncere@xxxxxxxxx> 2010-11-01 18:03:04 --- Some results with : - acpi_cpufreq.disable_average=1 clocksource=hpet and - acpi_cpufreq.disable_average=1 clocksource=hpet acpi_skip_timer_override * 2.6.36 (+ 4 Patches HW_COORD, SHARED_TYPE, HW_ALL, HW_STATISTICS) - Boot params for patch 4 : acpi_cpufreq.disable_average=1 - Boot params : clocksource=hpet # dmesg | grep cpufreq acpi-cpufreq: average (aperf/mperf) accounting disabled by user # cat /sys/devices/system/clocksource/clocksource0/available_clocksource tsc hpet acpi_pm # cat /sys/devices/system/clocksource/clocksource0/current_clocksource hpet # While CPU is idling : cpufreq-aperf CPU Average freq(KHz) Time in C0 Time in Cx C0 percentage 000 2688000 00 sec 033 ms 00 sec 966 ms 03 001 1944000 00 sec 017 ms 00 sec 982 ms 01 002 1776000 00 sec 001 ms 00 sec 998 ms 00 003 1536000 00 sec 002 ms 00 sec 997 ms 00 000 2496000 00 sec 028 ms 00 sec 971 ms 02 001 1656000 00 sec 032 ms 00 sec 967 ms 03 002 1536000 00 sec 018 ms 00 sec 981 ms 01 003 1416000 00 sec 003 ms 00 sec 996 ms 00 000 2712000 00 sec 036 ms 00 sec 963 ms 03 001 2064000 00 sec 014 ms 00 sec 985 ms 01 002 1416000 00 sec 001 ms 00 sec 998 ms 00 003 1392000 00 sec 001 ms 00 sec 998 ms 00 000 2688000 00 sec 034 ms 00 sec 965 ms 03 001 1920000 00 sec 017 ms 00 sec 982 ms 01 002 1584000 00 sec 001 ms 00 sec 998 ms 00 003 1536000 00 sec 002 ms 00 sec 997 ms 00 000 2712000 00 sec 041 ms 00 sec 958 ms 04 001 1968000 00 sec 023 ms 00 sec 976 ms 02 002 1512000 00 sec 008 ms 00 sec 991 ms 00 003 1560000 00 sec 004 ms 00 sec 995 ms 00 000 2784000 00 sec 040 ms 00 sec 959 ms 04 001 1896000 00 sec 022 ms 00 sec 977 ms 02 002 1416000 00 sec 008 ms 00 sec 991 ms 00 003 1488000 00 sec 003 ms 00 sec 996 ms 00 000 2736000 00 sec 042 ms 00 sec 957 ms 04 001 2160000 00 sec 018 ms 00 sec 981 ms 01 002 1512000 00 sec 007 ms 00 sec 992 ms 00 003 1608000 00 sec 003 ms 00 sec 996 ms 00 # While kernel is compiling (make -j 3) : cpufreq-aperf CPU Average freq(KHz) Time in C0 Time in Cx C0 percentage 000 2640000 00 sec 767 ms 00 sec 232 ms 76 001 2304000 00 sec 960 ms 00 sec 039 ms 96 002 2112000 00 sec 641 ms 00 sec 358 ms 64 003 2256000 00 sec 886 ms 00 sec 113 ms 88 000 2640000 00 sec 709 ms 00 sec 290 ms 70 001 2208000 00 sec 969 ms 00 sec 030 ms 96 002 2016000 00 sec 677 ms 00 sec 322 ms 67 003 2160000 00 sec 881 ms 00 sec 118 ms 88 000 2640000 00 sec 844 ms 00 sec 155 ms 84 001 2400000 00 sec 937 ms 00 sec 062 ms 93 002 2328000 00 sec 695 ms 00 sec 304 ms 69 003 2376000 00 sec 866 ms 00 sec 133 ms 86 000 2640000 00 sec 882 ms 00 sec 117 ms 88 001 2424000 00 sec 756 ms 00 sec 243 ms 75 002 2400000 00 sec 674 ms 00 sec 325 ms 67 003 2472000 00 sec 991 ms 00 sec 008 ms 99 # cpufreq-info current policy: frequency should be within 1.20 GHz and 1.20 GHz. * 2.6.36 (+ 4 Patches HW_COORD, SHARED_TYPE, HW_ALL, HW_STATISTICS) - Boot params for patch 4 : acpi_cpufreq.disable_average=1 - Boot params : clocksource=hpet acpi_skip_timer_override # dmesg | grep cpufreq acpi-cpufreq: average (aperf/mperf) accounting disabled by user # cat /sys/devices/system/clocksource/clocksource0/available_clocksource tsc hpet acpi_pm # cat /sys/devices/system/clocksource/clocksource0/current_clocksource hpet # dmesg | grep apic ACPI: Core revision 20100702 Setting APIC routing to flat ..TIMER: vector=0x30 apic1=0 pin1=0 apic2=-1 pin2=-1 ..MP-BIOS bug: 8254 timer not connected to IO-APIC ...trying to set up timer (IRQ0) through the 8259A ... ..... (found apic 0 pin 0) ... ....... works. # dmesg | grep intel_idle intel_idle: MWAIT substates: 0x1120 intel_idle: v0.4 model 0x25 intel_idle: lapic_timer_reliable_states 0xffffffff ACPI: acpi_idle yielding to intel_idle # While CPU is idling : cpufreq-aperf CPU Average freq(KHz) Time in C0 Time in Cx C0 percentage 000 2184000 00 sec 030 ms 00 sec 969 ms 03 001 1320000 00 sec 038 ms 00 sec 961 ms 03 002 1392000 00 sec 032 ms 00 sec 967 ms 03 003 1536000 00 sec 002 ms 00 sec 997 ms 00 000 1752000 00 sec 031 ms 00 sec 968 ms 03 001 1680000 00 sec 051 ms 00 sec 948 ms 05 002 1488000 00 sec 015 ms 00 sec 984 ms 01 003 1272000 00 sec 015 ms 00 sec 984 ms 01 000 2640000 00 sec 034 ms 00 sec 965 ms 03 001 1632000 00 sec 027 ms 00 sec 972 ms 02 002 1392000 00 sec 003 ms 00 sec 996 ms 00 003 1464000 00 sec 002 ms 00 sec 997 ms 00 000 2712000 00 sec 038 ms 00 sec 961 ms 03 001 1776000 00 sec 020 ms 00 sec 979 ms 02 002 1464000 00 sec 002 ms 00 sec 997 ms 00 003 1488000 00 sec 003 ms 00 sec 996 ms 00 # cpufreq-info current policy: frequency should be within 1.20 GHz and 1.20 GHz. In all cases, cpufreq-info always reports a 1.20GHz max limit, but cpufreq-aperf the opposite ; During high loads, frequencies manage to jump up to 2.64GHz. It took the same amount of time to compile the kernel than with my reference kernel (2.6.32) and CPU reached 72ÂC. I can conclude that CPU states reported by cpufreq-info are wrong. (My conky desktop monitor applet does not seem to read info from cpufreq-aperf or equivalent, because it always reports frequencies at 1.20GHz like cpufreq-info). With hpet clocksource, average frequencies at idle time are very high, higher than with tsc clocksource (which are in the first hand strangely high for idle time), specially for the CPU 0, (2,7 GHz for 3% load !!!), but it does not seem to raise the temperature. I expect to have all my virtual cores at 1.20GHz (or less) at idle time, but even with my reference kernel, this ideal state was never reached. With acpi_skip_timer_override parameter, the kernel reports at boot time some verbosities related to IO-APIC. -- Configure bugmail: https://bugzilla.kernel.org/userprefs.cgi?tab=email ------- You are receiving this mail because: ------- You are on the CC list for the bug.-- 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
