[Novalug] VirtualBox running Windows 7 on Arch lowering battery life

[Maxwell Spangler]

On Wed, 2010-04-21 at 17:54 -0600, Maxwell Spangler wrote:
> On Wed, 2010-04-21 at 16:44 -0700, Bryan J. Smith wrote:
> > System Activity Reporter (sar) will capture all sorts of statistics.
> > 
> > There are two (2) causes ...
> > 
> > 1.  If you have the dual-core ULV Pentium 1810T, you're making heavy
> > use of that 2nd core now.  That could easily eat up another 5-10Whr.
> 
> Just that one chip?
> 
> Is there a way to disable additional cores on the fly in Linux?  Seems
> like if the chip can shut down additional cores when you're not using
> them (or choose not to use them) it would save plenty.  But I'd only see
> this as really useful if you didn't have to reboot and supply boot
> parameters to enable/disable this.
> 

Perhaps someone could try:

disable second core:

echo 0 | sudo tee /sys/devices/system/cpu/cpu1/online

re-enable second core:

echo 1 | sudo tee /sys/devices/system/cpu/cpu1/online

-- 
Maxwell Spangler
========================================================================
        Linux, Unix and Database Administration
        Currently: Boulder, Colorado
        LinkedIn: http://www.linkedin.com/in/maxwellspangler