CPU fan, CPU speed control
Hi, I've just got a laptop with a Pentium 4 3.0 GHz CPU. The fan is very
noisy and seems to stay on all the time. I've been interested in the
recent discussion on this list about CPU speed control because I was
wondering whether the fan might turn off at times when the CPU was going
slower (plus it'd be good for batteries). However I'm new to debian and
linux and have not managed to get cpudynd or cpufreq working. I haven't
tried powernowd which I understand requires kernel 2.6. I'd be very
grateful for any suggestions about how to get control over the CPU speed
and/or calm the fan down a bit if/when it's not needed. Below is a
description of my attempt to get cpudynd working, with and withough ACPI.
I'm running kernel 2.4.22 at the moment. I installed and tried to get
working cpudynd:
dd:/home/dan# cpudynd
cpudynd version 0.4.7 Copyright: Ricardo Galli <gallir@uib.es>
cpudynd: CPU frequency control disabled
Error: Nothing to do, exiting
I tried this with APM options enabled in my kernel compilation, and now
I've enabled ACPI options as well and get the same response. How do I
enable CPU frequency control in this case?
More info:
Since having ACPI options included in my kernel, things seem to think I
have two CPUs. Is this normal/correct? Now when I look at /proc/cpuinfo I
get
dd:/proc# cat cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 15
model : 2
model name : Intel(R) Pentium(R) 4 CPU 3.00GHz
stepping : 9
cpu MHz : 3000.144
cache size : 512 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm
bogomips : 5989.99
processor : 1
vendor_id : GenuineIntel
cpu family : 15
model : 2
model name : Intel(R) Pentium(R) 4 CPU 3.00GHz
stepping : 9
cpu MHz : 3000.144
cache size : 512 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca
cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm
bogomips : 5989.99
The contents of /proc/acpi/processor/CPU1/info are:
dd:/proc/acpi/processor/CPU1# cat info
processor id: 0
acpi id: 1
bus mastering control: yes
power management: no
throttling control: yes
performance management: no
limit interface: yes
And BTW, is there any chance that the fan will turn off or slow down a bit
at lower CPU speeds (Do they (always) have a thermostat or something?)
Thanks a lot,
Dan
--------------------------------------------------
dan davison
http://home.uchicago.edu/~davison/
On Fri, 21 Nov 2003, Steffen Klemer wrote:
> Am 2003.11.19 09:48 schrieb(en) Serge Gebhardt:
> > On Wed, 19 Nov 2003 00:18:22 -0500
> > Mike Phillips <phillim2@comcast.net> wrote:
> >
> > > Non ACPI just gives you two speeds to work with, full 1.8 and slow
> > > 1.2.
> > >
> > > echo "1200000:1800000:powersave" > /proc/cpufreq.
> > > echo "1200000:1800000:performance" > /proc/cpufreq to restore.
> >
> > awesome. It seems I can even get it down to 250 MHz. The system would
> > get really slow and /proc/cpuinfo would show the right frequency. But
> > when measured with specific tools (eg x86info), they all find the
> > CPU running at 2GHz (I have a 2GHz T30). These tools do not just read
> > the identifier, they actually _measure_ the frequency.
>
> Yes, but I noticed, that this measuring is sometimes not that effective.
> For example I use the gkrellm-gkx86info - plugin and even on a non-cpu-
> scaling kernel it shows frequencies that can't be true (e.g. 1200 instead
> of 1800MHz on my Athlon mobile)
>
> > > You can actually tweak the cpu through the acpi interface too:
> > >
> > > echo "N" > /proc/acpi/processor/CPU/throttling where 0 <= N <= 7.
> > >
> > > This really does work, try it with "7" and watch the system crawl,
> > not
> > > sure if this saves any power though.
> >
> > This seems to just throttle the CPU by putting load on it. After
> > `echo 7 > /proc/acpi/processor/CPU/throttling` the system becomes
> > really slow because of CPU load. It is certainly not the best way to
> > save power :)
>
> No, it's no cpu-load but only cpu-time that is "wasted" with doing nothing
> - so it feels slower and don't get that hot.
>
> > But are there some daemons around, which switch the frequency
> depending
> > on CPU load? That's what I need in the first place. Compiling should
> be
> > really fast (2GHz) but I don't mind having the CPU at 250MHz while
> > working. The switch should automatically be done in background.
>
>
> Yes, powernowd does it in a great fashion. It's now avaiable in unstable!
> - it also supports speedstep :)
>
> But you have to compile in the "userspace-governor". (Power Management ->
> CPU Frequency -> Frequency Scaling -> userspace governor
> And to be sure also the old 2.4 /proc/sys interface...
>
> Than cpudyn works as well and you also get /sys/.../scaling_avail_freq
>
>
> cu
> /Steffen
>
> --
> /"\
> \ / ASCII Ribbon Campaign | "The best way to predict
> X * NO HTML/RTF in e-mail | the future is to invent it."
> / \ * NO MSWord docs in e-mail| -- Alan Kay
>
>
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