RE: cpufreq stops working after a while

From: Carlos Garcia Campos <carlosgc@gnome.org>
To: "Pallipadi, Venkatesh" <venkatesh.pallipadi@intel.com>
Cc: cpufreq@lists.linux.org.uk
Subject: RE: cpufreq stops working after a while
Date: Tue, 15 Aug 2006 17:07:42 +0200	[thread overview]
Message-ID: <1155654463.12437.6.camel@localhost.localdomain> (raw)
In-Reply-To: <EB12A50964762B4D8111D55B764A84546F986C@scsmsx413.amr.corp.intel.com>

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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
> >
> >El mar, 15-08-2006 a las 09:49 +0200, Thomas Renninger escribió:
> >> On Sat, 2006-08-12 at 10:52 +0200, Erik Slagter wrote:
> >> > On Fri, 11 Aug 2006 14:25:26 -0400 Mark Lord <lkml@rtr.ca> wrote:
> >> > 
> >> > > One of my notebooks (Dell Latitude X1) has a 1.1GHz 
> >Pentium-M ULV processor.
> >> > > This chip can change CPU speeds from 600 -> 800 -> 1100 Mhz.
> >> > > 
> >> > > I use speedstep-centrino with it, and after boot all is 
> >usually okay.
> >> > > But after a few hours of operation, it stops shifting to 
> >the highest frequency
> >> > > even under continuous 100% load (or not).  Eventually it 
> >gets stuck at 600Mhz
> >> > > and stays there until I reboot.
> >
> >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)

> 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. 

> Thanks,
> Venki
> 

Thanks a lot, 
-- 
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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