Coming back to battery usage… I did some experiments.
After reboot, and after an uptime of 4 days, I recorded actual cpu frequency every 10 seconds, while doing basically the same thin (reading text with an elaborated rss reader, which basically is scrolling, text display and internet, with all my background processes untouched).
The script is this:
while :
do
s=$(date +%s)
for i in $(echo /sys/devices/system/cpu/cpu?/cpufreq/cpuinfo_cur_freq)
do
echo -n "$s;"
cat $i
done
sleep 10
done
Which gives up to 4 values per query. Reformatted with a small perl programm I create a csv (available on request, 24lines), which I then import into oocalc for a diagram (phew, quite some complicated massaging… ;-)) Here I can see that
- cpu generally runs faster
- more cores are active
after some days.
After the reboot:
After 4 days of uptime
Additionally, after reboot the charging current varies between 500 and 700 mA, after 4 days I only get a maximum of 400mA…
Klaus