One-shot-oriented event timers management
Kevin Oberman
oberman at es.net
Tue Sep 7 17:46:44 UTC 2010
> From: Ian FREISLICH <ianf at clue.co.za>
> Date: Tue, 07 Sep 2010 13:40:33 +0200
> Sender: owner-freebsd-current at freebsd.org
>
> Peter Jeremy wrote:
> > On 2010-Sep-02 13:08:25 +0200, Ian FREISLICH <ianf at clue.co.za> wrote:
> > >It's a compaq mini-110:
> > >CPU: Intel(R) Atom(TM) CPU N270 @ 1.60GHz (1596.22-MHz 686-class CPU)
> >
> > Hmmm... I have a N270 in an Aspire One.
> >
> > >dev.cpu.0.freq_levels: 1600/25000 1400/21875 1333/18000 1166/15750 1067/11=
> > 000 933/9625 800/5000 700/4375 600/3750 500/3125 400/2500 300/1875 200/1250=
> > 100/625
> >
> > That's rather more frequencies than I would expect. Do you have
> > acpi_throttle enabled? If so, you might like to disable it - it's not
> > particularly effective (and caused regular hands on my AMD Turion
> > laptop).
>
> No acpi_throttle in my sysctl mib:
> [mini] ~ $ sysctl -a |grep acpi_throttle
> [mini] ~ $
>
> I can set all of these frequencies. They don't really save any
> power, they just make the system slow.
>
> > >dev.cpu.0.cx_supported: C1/1 C2/1 C3/17 C4/57
> >
> > I'm also intrigued as to where C4 comes from. I have:
> >
> > dev.cpu.0.freq_levels: 1600/2000 1333/1533 1066/1066 800/600
> > dev.cpu.0.cx_supported: C1/1 C2/1 C3/57
>
> And I can set C4. But the acpi battery method can't determine the
> discharge rate so I don't know if it actually reduces power either.
>
> [mini] ~ $ acpiconf -i 0
> Design capacity: 5100 mAh
> Last full capacity: 4952 mAh
> Technology: secondary (rechargeable)
> Design voltage: 10800 mV
> Capacity (warn): 496 mAh
> Capacity (low): 347 mAh
> Low/warn granularity: 0 mAh
> Warn/full granularity: 100 mAh
> Model number: Primary
> Serial number:
> Type: LION
> OEM info: Hewlett-Packard
> State: discharging
> Remaining capacity: 100%
> Remaining time: unknown
> Present rate: unknown
> Voltage: 12363 mV
>
> It might have something to do with the hardware verdor or bios vendor.
Throttling is currently (unfortunately) on by default. You need to turn
it off by adding:
hint.p4tcc.0.disabled="1"
hint.acpi_throttle.0.disabled="1"
to your /boot/loader.conf file. You really only want EST or
equivalent. I'd love to see throttling/TCC removed.
--
R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: oberman at es.net Phone: +1 510 486-8634
Key fingerprint:059B 2DDF 031C 9BA3 14A4 EADA 927D EBB3 987B 3751
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