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I have an AMD A8-5600K and the CPU frequency doesn't seem to ever reach the "turbo" frequency (3.9GHz). I double checked all BIOS options and my CPU is only ~35c (measured with k10temp) at full load so there's no heat issue. I'm checking the frequency with `cat /sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_cur_freq` and the cpu load (from `top`) is currently "load average: 8.47, 9.03, 6.90". After checking the wiki, I think the problem is that `/sys/devices/system/cpu/cpu0/cpufreq/bios_limit` is the stock frequency (3.6GHz), not the turbo frequency. The wiki says you can configure the kernel to ignore the BIOS limit, but it's dangerous and shouldn't be necessary.
It seems like the kernel's CPU scaling is better than turbo mode (which works in Windows 7; I dual-boot), so would it be better to overclock the CPU to the turbo frequency (or higher) and forget about the actual turbo mode? I'll want to keep it enabled in the BIOS for Windows 7, so what is the best way to overclock from within Linux? Or, what's the best way to get the most out of my processor in both OS's?
Last edited by aiu (2013-09-26 05:12:18)
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I just found the k10ctrl page on the wiki that explains how to overclock an AMD processor, and I'm assuming the warning about ignoring the BIOS limit on the cpufreq archwiki page is the standard overclocking warning, so I'm marking this as solved.
https://wiki.archlinux.org/index.php/K10ctl
Edit: Nevermind, my processor isn't supported by k10ctrl.
Last edited by aiu (2013-09-26 05:13:13)
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This sysfs file shows frequency requested by CPUFreq, which only works with "normal" frequencies. Turbo mode is enabled autonomously by hardware and CPUFreq doesn't even know it exists.
Use cpupower monitor to get exact frequency (average over one second or so).
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