[ltp] Re: Re: Re: Stress testing for undervolting

[Laurent Gilson]

On Mon, 17 Jul 2006 10:10:57 +0200, Florian Manschwetus  
<florianmanschwetus@gmx.de> wrote:

> Is some where a good howto for undervolting, because id like to test my
> T60 with undervolting.

Is it a pentiumM ? => Read:
http://www.thinkwiki.org/wiki/Pentium_M_undervolting_and_underclocking
http://gentoo-wiki.com/HOWTO_Undervolt_a_Pentium_M_CPU (currently down,  
just use the google cache:  
http://64.233.183.104/search?q=cache:FCkDrGKKIjYJ:gentoo-wiki.com/HOWTO_Undervolt_a_Pentium_M_CPU+&hl=en&ct=clnk&cd=1&client=opera  
)

Alternative 2 from thinkwiki is the same thing as described in the  
gentoo-wiki. I donīt like Alternative 1 at all.

You will need a recent kernel-source (> 2.6.10) and apply the  
bdz.undervolt.XXXX.XX.XX.X.patch file. "patch -p 0 <  
bdz.undervolt.XXXX.XX.XX.X.patch" will apply the patch to the kernel (if  
launched in the right directory. For starters try /usr/src/linux).

After that you need to patch (ibm_acpi, tp_smapi...), configure (copy  
/proc/config.gz to /usr/src/linux/.config) and build the kernel (make;  
make modules; make image ... depends on your distri). Install/configure it  
in grub and reboot.

Look for /sys/devices/system/cpu/cpu0/cpufreq/op_points_table or  
/sys/devices/system/cpu/cpu0/cpufreq/voltage_table (depending on the  
patch-version).

cu