Re: Updated acpi_cpu patch

From: Lukas Ertl <l.ertl_at_univie.ac.at>
Date: Fri, 21 Nov 2003 23:45:41 +0100 (CET)
On Fri, 21 Nov 2003, Nate Lawson wrote:

> > > On Tue, 18 Nov 2003, Lukas Ertl wrote:
> > > > I'm gonna try some "buildkernelstones" with the different settings.  If
> > > > you have some special benchmarks in mind I'd be happy to run them.
> > >
> > > That's probably ok.  It has a lot of IO.
> >
> > Now I've tried running make buildkernel and tarring /usr/src to a
> > different location, with different setting for hw.acpi.cpu.cx_lowest.  I
> > couldn't see any real difference - neither in performance nor in heat
> > emission.
>
> Well, heat emission will be high during benchmarks because the CPU is
> rarely idle.  My fan always comes on my laptop during buildworld.  But the
> difference is when it's mostly idle (checking email, web browsing).  With
> machdep.cpu_idle_hlt=0, the fan is always on even when the box is sitting
> there.  With cpu_idle_hlt=0 and cx_lowest=0 (C1), the fan goes off but the
> box is still warm.  With cx_lowest=2 (C3, 120 us transition time), the box
> is very cool but some IO gets a little slower (serial port).  But not
> much.

The problem is that the fan in this machine always kicks in after several
minutes, and then stays on.  This is very annoying.

BTW, I'm having another ACPI question, do these figures here make sense?

hw.acpi.thermal.tz0._PSV: 3627
hw.acpi.thermal.tz0._CRT: 3662

If I understood the ACPI spec correctly, _PSV is the temperature where
passive cooling actions begin, and _CRT is the critical temp, where the OS
should initiate a shutdown.  First, _PSV seems to be way to high, and
second, they are so close to each other.

> Those are what is more interesting.  Also, can you send me your sysctl
> hw.acpi.cpu.cx_history after you've used it for a while with the maximum
> cx_lowest setting?

Ok, no problem.

regards,
le

-- 
Lukas Ertl                             eMail: l.ertl_at_univie.ac.at
UNIX Systemadministrator               Tel.:  (+43 1) 4277-14073
Vienna University Computer Center      Fax.:  (+43 1) 4277-9140
University of Vienna                   http://mailbox.univie.ac.at/~le/
Received on Fri Nov 21 2003 - 13:45:54 UTC

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