On Sat, Jan 05, 2013 at 05:30:43PM -0500, Baho Utot wrote:
> >
> > As for cpu frequency, I think that mine is by default set to "ondemand"
> > on this machine.
>
> Just loading the module or building it into the kernel won't suffice.
>
Please note that I don't build the driver as a module. For my
x86_64 machines I've always used ondemand and just set up a
bootscript.
The following is what I'm using for LFS-7.2. On a multiprocessor
system it needs to be repeated for each cpu [ cpu0..3 in my case ].
#!/bin/sh
. /lib/lsb/init-functions
case "${1}" in
start|demand)
log_info_msg "Enabling ondemand cpu frequency"
echo ondemand
>/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
evaluate_retval
;;
powersave)
log_info_msg "Enabling powersave cpu frequency"
echo powersave
>/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
evaluate_retval
;;
performance)
log_info_msg "Enabling performance cpu frequency"
echo performance
>/sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
evaluate_retval
;;
*)
echo "Usage: ${0} {start|demand|powersave|performance}"
exit 1
;;
esac
I wasn't intending show you my code to modify this after it has been
copied in, because it is really ugly, but in the end it's easier to
show it as one way which works to copy and alter the relevant lines.
The debugging info is there in case it fails - only ever tested with
4 CPUs.
# if more than 1 cpu, replicate for all of them - print debug info while it
checks
echo -n "searching to see if more than one cpu... "
let EXTRACPUS=`cat /proc/cpuinfo | grep MHz | wc | awk '{ print --$1 }'`
if [ $EXTRACPUS -gt 0 ]; then
echo "yes"
PREV=0
THIS=1
echo "entering loop for $EXTRACPUS pass(es), copying $PREV to $THIS"
while [ $EXTRACPUS -gt 0 ]; do
echo "adding cpufreq for processor $THIS"
sed -i "/cpu$PREV/s/\(^.*\)$PREV\(.*$\)/\1$PREV\2\n\1$THIS\2/g"
\
/etc/rc.d/init.d/cpufreq
# let returns zero for non-zero result and vice versa
let PREV=$PREV+1
let THIS=$THIS+1
let EXTRACPUS=$EXTRACPUS-1
echo "debug, after this pass values are $EXTRACPUS $PREV $THIS"
done
fi
My old ppc64 was much more involved - had to load powernowd to be
able to control the frequency.
I'll also note that you can specify a default governor in the
kernel.
ĸen
--
das eine Mal als Tragödie, das andere Mal als Farce
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