Re: [patch] i386 dynamic ticks 2.6.13-rc4 (code reordered)

Pavel Machek
2005-08-08T22:17:21Z

Hi!

> > I monitored
> > power utilization using pmstats-0.2, and used
> > /proc/acpi/processor/CPU/power to monitor bus mastering activity and the
> > CPU C-states.
> >
> > As soon as I disabled dynamic tick using:
> >
> > echo 0 > /sys/devices/system/timer/timer0/dyn_tick_state
> >
> > The number of ticks went up to 1024, bus mastering activity dropped to
> > zero, and the processor entered C4 state, and power utilization
> > dropped by 20%.
> >
> > When I enabled dynamic tick using:
> >
> > echo 1 > /sys/devices/system/timer/timer0/dyn_tick_state
> >
> > The number of ticks dropped down to 60-70 HZ, bus mastering activity
> > jumpped up to being almost always active,
>
> Anyone know why this would happen?

Bus mastering monitor was broken last time I checked... it depended on
HZ in ugly way or something like that. It was on ACPI mailing lists.

Pavel
--
if you have sharp zaurus hardware you don't need... you know my address