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Date:      Thu, 12 Apr 2012 21:13:30 -0600 (MDT)
From:      Warren Block <>
To:        Florian Unglaub <>
Subject:   Re: Intel turbo mode support
Message-ID:  <>
In-Reply-To: <>
References:  <>

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On Thu, 12 Apr 2012, Florian Unglaub wrote:

> I've stumbled upon 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_flags="-a hadp -n hadp"

During a buildworld, dev.cpu.0.freq goes to 5801.

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