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Date:      Fri, 13 Jan 2006 13:15:21 +1030
From:      "Daniel O'Connor" <doconnor@gsoft.com.au>
To:        freebsd-stable@freebsd.org
Cc:        Mike Jakubik <mikej@rogers.com>, stable@freebsd.org, Ivan Voras <ivoras@fer.hr>
Subject:   Re: powerd effectiveness
Message-ID:  <200601131315.23059.doconnor@gsoft.com.au>
In-Reply-To: <43C6584F.10001@fer.hr>
References:  <43C5A261.1020407@rogers.com> <43C6584F.10001@fer.hr>

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On Thu, 12 Jan 2006 23:53, Ivan Voras wrote:
> dev.cpu.0.freq_levels: 1403/-1 1315/-1 1227/-1 1139/-1 1052/-1 964/-1
> 876/-1 789/-1 701/-1 613/-1 526/-1 438/-1 350/-1 263/-1 175/-1 87/-1

I have a Pentium-M which shows -1 like that..
I think it's just that ACPI is not supplying power consumption data.

> I think the infrastructure used by powerd supports both cases, but won't
> get you much savings if the CPU doesn't support the first case.

powerd only uses the sysctl's - it doesn't need to know specific details as=
=20
long as the cpufreq infrastructure understands your system.

> What I would like for FreeSBD to support is turning off of devices like
> WinXP does. Not only hard drives, but it seems that WinXP can somehow
> turn off network cards, USB controllers and/or devices and similar
> peripherals when running on batteries and those are not used (it seems
> it's not like disabling them completely but something else).

I believe FreeBSD turns PCI cards off if there is no driver attached.

I don't think XP actually turns those devices off if you are actually using=
=20
them. Not sure about the specifics for stuff like USB (ie what happens if=20
it's sleeping and you connect a USB peripheral)

=2D-=20
Daniel O'Connor software and network engineer
for Genesis Software - http://www.gsoft.com.au
"The nice thing about standards is that there
are so many of them to choose from."
  -- Andrew Tanenbaum
GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C

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