After realising that /proc/acpi/processor/CPU1/performance and /proc/acpi/processor/CPU1/power is not supported on my notebook (Gericom X5 Force, Pentium 4 Mobile CPU [not Centrino, but Speedstep enabled]), I found out, that /proc/acpi/processor/CPU1/throttling works very well and can be changed! So I wrote a little script to switch up and down CPU throttling (cpu_switch). I testet it with a small PHP script. (pbench) Here are the results for my notebook: 100% 1m55.254 47% 4m2.310 7% 22m25.512 So it seems to do something :) cpu_switch: --------start-------- #!/bin/sh cpu="/proc/acpi/processor/CPU1/throttling" cur_t=`cat $cpu | grep "*" | cut -dT -f2 | cut -d: -f1` min_t=`cat $cpu | grep "T*%" | head -n 1 | tr -d "*" | cut -d: -f1 | cut -dT -f2` max_t=`cat $cpu | grep "T*%" | tail -n 1 | tr -d "*" | cut -d: -f1 | cut -dT -f2` #echo "cur: " $cur_t #echo "min: " $min_t #echo "max: " $max_t msg1="Switching to " msg2="Switching one step " err=1 if [ "$1" == "" ]; then err=1 else if [ "$1" == "fastest" ]; then err=0 echo $msg1 $1 echo $min_t > $cpu fi if [ "$1" == "slowest" ]; then err=0 echo $msg1 $1 echo $max_t > $cpu fi if [ "$1" == "slower" ]; then err=0 new=$(($cur_t+1)) if [ $new -gt $max_t ]; then new=$max_t fi p=$((100 - $new * 100 / $max_t)) echo $msg2 $1 "($p%)" echo $new > $cpu fi if [ "$1" == "faster" ]; then err=0 new=$(($cur_t-1)) if [ $new -lt $min_t ]; then new=$min_t fi p=$((100 - $new * 100 / $max_t)) echo $msg2 $1 "($p%)" echo $new > $cpu fi fi if [ $err == 1 ]; then echo "$0 <fastest | slowest | faster | slower>"; p=$((100 - $cur_t * 100 / $max_t)) echo "Currently running at $p%" fi ---------end--------- pbench (time php pbench): --------start-------- <?php $outer=1000; $inner=10000; for ($i = 0; $i < $outer; $i++) { for ($j = 0; $j < $inner; $j++) { $a = $i + $j; $b = $outer - $i; $c = $inner - $j; $d = $i * $j; $e = $i - $j; $f = $i / (1+$j); $g = $a + $b; $h = $c + $d; $k = $e + $f; $l = $g + $h; $m = $l + $k; $n = ((((($i*2)*4)*$j)*6)/13.86751); } } ?> ---------end--------- It would be nice to have a something like this integrated in KLaptop, since I use this for my notebook. It would be also nice, to have real speedstep control in the kernel. Suse 9.0 has it in the kernel + configuration tools, but it doesn't work with Pentium 4 Mobile CPU (which my notebook has). Reproducible: Always Steps to Reproduce: 1. 2. 3.
I apprecate the report, but for desired integration you should report it directly to the KDE team.
