RE: cpufreq stops working after a while

[Carlos Garcia Campos <carlosgc@gnome.org>]

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El mar, 15-08-2006 a las 08:23 -0700, Pallipadi, Venkatesh escribió:
>  
> >-----Original Message-----
> >From: Carlos Garcia Campos [mailto:carlosgc@gnome.org] 
> >Sent: Tuesday, August 15, 2006 8:08 AM
> >To: Pallipadi, Venkatesh
> >Cc: cpufreq@lists.linux.org.uk
> >Subject: RE: cpufreq stops working after a while
> >
> >El mar, 15-08-2006 a las 06:27 -0700, Pallipadi, Venkatesh escribió:
> >>  
> >> >-----Original Message-----
> >> >From: cpufreq-bounces@lists.linux.org.uk 
> >> >[mailto:cpufreq-bounces@lists.linux.org.uk] On Behalf Of 
> >> >Carlos Garcia Campos
> >> >Sent: Tuesday, August 15, 2006 4:07 AM
> >> >To: cpufreq@lists.linux.org.uk
> >> >Subject: Re: cpufreq stops working after a while
> >> >
> >> >
> >> >I have the same problem. My laptop is Dell Latitude D600 (Intel(R)
> >> >Pentium(R) M processor 1.60GHz). If I'm compiling something, for
> >> >example, that takes a long time, scaling_max_freq is set to 
> >600000 (the
> >> >lowest). If I try to echo 1600000 to scaling_max_freq it do nothing.
> >> >Only after some time if the cpu load is not high I can 
> >echoing 1600000
> >> >again and it works without need to reboot. 
> >> >
> >> 
> >> Looks like you have the same problem that Mark had in this 
> >original thread. Thermal.
> >
> >It never happened with older kernels (< 2.6.17, I think)
> >
> 
> Can you confirm the latest version of the kernel where the problem was not there. That will help on narrowing this down.

I'm not sure at all . . . I don't have any kernel < 2.6.17 compiled
right now.

> >> It is not a bug in cpufreq. Just that due to cpu load, 
> >system is getting heated up and platform decides to reduce the 
> >temperature using passive cooling and as a result reduces the 
> >frequency. Does your system have active cooling (fans) or does 
> >it allow only passive cooling? You can monitor the temperature 
> >by looking at stuff under /proc/acpi/termal_zone/*/*.
> >
> >Yes, my system has fans. Here is the contents of the files
> >under /proc/acpi/termal_zone/*/*, if it helps:
> >
> >$ cat /proc/acpi/thermal_zone/THM/*
> ><setting not supported>
> >cooling mode:   critical
> ><polling disabled>
> >state:                   ok
> >temperature:             47 C
> >critical (S5):           102 C
> >
> >How can I solve the problem then? It's very annoying. 
> 
> 
> Can you watch the temperature as you see the frequency drop. Continuously (every second) cat cpufreq_max_freq in /sys and temperature in /proc as you run you load. My feeling is you will see the drop in max freq as your temperature goes to around 60 degrees or so.

Here are the results:

................
1600000 - 85 C
1600000 - 84 C
1600000 - 85 C
1600000 - 76 C
600000 - 76 C
600000 - 71 C
600000 - 70 C
600000 - 69 C
................

It changed at 76 C.

> 
> Thanks,
> Venki
> 
-- 
Carlos Garcia Campos (KaL)
   elkalmail@yahoo.es
   carlosgc@gnome.org
   http://carlosgc.linups.org
PGP key: http://pgp.mit.edu:11371/pks/lookup?op=get&search=0x523E6462

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