On Thu, 12 Apr 2012, Florian Unglaub wrote:
I've stumbled upon http://goo.gl/Aq6Vd in the freebsd-current mailling list
and started investigating if turbo mode is working on my i7 860 here. The CPU
stock frequency is 2.8GHZ which is the maximum that dev.cpu.0.freq_levels
reports (powerd is enabled). According to the link above, freq_levels should
show a maximum frequency of 2801 if turbo mode is working.
The patch above was MFC'ed quite a while ago. I updated to 9-stable yesterday
and it looks like the turbo is not working. dev.cpu.0.freq is at max. 2.8GHz,
even if I am using some CPU stress testing utilities (like burnP6).
Works here on an i5, amd64:
dev.cpu.0.freq_levels: 5801/300000 5800/300000
I found this by accident, noticing only that a buildworld suddenly was a
lot faster when powerd was running.
powerd_enable="YES"
powerd_flags="-a hadp -n hadp"
performance_cpu_freq="HIGH"
During a buildworld, dev.cpu.0.freq goes to 5801.
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