https://bugzilla.kernel.org/show_bug.cgi?id=62861 Bug ID: 62861 Summary: Maximum CPU voltage level never reached on AMD A8-5500 Product: Power Management Version: 2.5 Kernel Version: 3.12.0-rc4+ Hardware: All OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: cpufreq Assignee: cpufreq@xxxxxxxxxxxxxxx Reporter: laszlo.kertesz@xxxxxxxxx Regression: No I noticed this issue in the kernel 3.12 rc4 (built from git): The CPU should have its voltages in the 0.9-1.34v range (it was until rc3 at least). In the rc4 builds it only goes up to 1.22v, but the lower range is modified too - it no longer stays at 0.9, it bounces between as low as 0.64 and 0.9, usually stays in the 0.85-0.88 range. The result is: lower temperatures (~5C) and lower processor speeds+performance. This CPU has its nominal frequency at 3.2 GHz and a turbo frequency of 3.7 GHz (theoretic, under Linux at least i seen max 3.6, mostly its ~3.5). Anyway, in typical usage if 1 or 2 cores are used, it can be at ~3.5GHz quite long before throttling down. Using all 4 cores (compiling with 4 threads) usually goes at ~3.3 mostly with an initial 3.5 for a half minute or so with CPU voltage at 1.34v. Now with this capping at 1.22v this what i get (no turbo core or anything): 'sensors' output under full load, 4 threads compile (in0 is the CPU voltage): it8728-isa-0228 Adapter: ISA adapter in0: +1.22 V (min = +0.00 V, max = +3.06 V) in1: +1.64 V (min = +0.00 V, max = +3.06 V) in2: +2.00 V (min = +0.00 V, max = +3.06 V) in3: +2.05 V (min = +0.00 V, max = +3.06 V) in4: +1.99 V (min = +0.00 V, max = +3.06 V) in5: +2.22 V (min = +0.00 V, max = +3.06 V) in6: +2.22 V (min = +0.00 V, max = +3.06 V) 3VSB: +3.36 V (min = +0.00 V, max = +6.12 V) Vbat: +3.31 V fan1: 2576 RPM (min = 0 RPM) fan2: 906 RPM (min = 0 RPM) fan3: 0 RPM (min = 0 RPM) fan4: 0 RPM (min = 0 RPM) fan5: 0 RPM (min = 0 RPM) temp1: +29.0°C (low = +127.0°C, high = +127.0°C) sensor = thermistor temp2: -8.0°C (low = +127.0°C, high = +127.0°C) sensor = thermistor temp3: +49.0°C (low = +127.0°C, high = +127.0°C) sensor = Intel PECI intrusion0: OK 'cpufreq-aperf' output under full load, 4 threads compile: # cpufreq-aperf -o CPU Average freq(KHz) Time in C0 Time in Cx C0 percentage 000 3168000 00 sec 933 ms 00 sec 066 ms 93 001 3168000 00 sec 970 ms 00 sec 029 ms 97 002 3168000 00 sec 894 ms 00 sec 105 ms 89 003 3168000 00 sec 962 ms 00 sec 037 ms 96 This 3168000 KHz happens even i have only 1 core loaded, which before had ~3.488 GHz according to cpufreq-aperf. /sys/devices/system/cpu/cpu1/cpufreq/cpb has the value of 1 so i guess turbo core is still enabled but because of this voltage capping it never happens. Temperature isnt an issue, since this way the CPU goes up to 50C, before was max ~55C with better performance. Note that i use the radeon driver. -- You are receiving this mail because: You are the assignee 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
