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Date:      Mon, 8 Mar 2010 14:29:52 +0200
From:      Dan Naumov <dan.naumov@gmail.com>
To:        FreeBSD-STABLE Mailing List <freebsd-stable@freebsd.org>, Jeremy Chadwick <freebsd@jdc.parodius.com>,  Attilio Rao <attilio@freebsd.org>
Subject:   RE: powerd on 8.0, is it considered safe?
Message-ID:  <cf9b1ee01003080429n6398dd32ke5247e5833a338d4@mail.gmail.com>

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>Up until this point, I wasn't using powerd on this new Atom D510
>system. I ran sysctl and noticed that dev.cpu.0.freq: is actually 1249
>and doesn't change no matter what kind of load the system is under. If
>I boot to BIOS, under BIOS CPU is shown as 1,66 Ghz. Okayy... I guess
>this explains why my buildworld and buildkernel took over 5 hours if
>by default, it gets stuck at 1249 Mhz for no obvious reason. I enabled
>powerd and now according to dev.cpu.0.freq:, the system is permanently
>stuck at 1666 Mhz, regardless of whether the system is under load or
>not.

OK, a reboot somehow fixed the powerd issue:

1) Disabled powerd
2) Rebooted
3) Upon bootup, checked dev.cpu.0.freq - it's stuck at 1249 (should be
1666 by default)
4) Enabled and started powerd - CPU scales correctly according to load

There is some bug somewhere though, because something puts my CPU to
1249 Mhz upon boot with powerd disabled and it gets stuck there, this
shouldn't happen.


- Sincerely,
Dan Naumov



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