Re: Debian on the Desktop - plans for Lenny?
On Sat, Aug 11, 2007 at 01:07:39PM +0200, Petter Reinholdtsen wrote:
> [Wouter Verhelst]
> > Except that a PowerPC processor (as found in Gustavo's ibook) simply
> > doesn't *have* C states. On my PowerBook G4, I noticed that when I
> > started running this crude hack...
> > ------
> > #!/bin/bash
> > modprobe cpufreq_userspace
> > echo $$ > /var/run/mycpufreqd
> > echo userspace > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
> I suspect you will get almost the same behavior by using this hack and
> leaving it to the kernel to scale it:
> modprobe cpufreq_userspace
> echo $$ > /var/run/mycpufreqd
> echo ondemand > /sys/devices/system/cpu/cpu0/cpufreq/scaling_governor
> It will jump to the highest frequency when the load is high, and drop
> to the lowest frequency when there is less load.
Except that the kernel refuses to do this on PowerPC, since the
'ondemand' governor wants a CPU to switch speed so ridiculously quickly.
Been there, tried that.
Anyway, the point wasn't to demonstrate how to do processor speed
scaling; rather, the point was to demonstrate that what happens to be
correct for i386 and family isn't necessarily correct for everything
<Lo-lan-do> Home is where you have to wash the dishes.
-- #debian-devel, Freenode, 2004-09-22