sysctl support for ICTC

[Paul Mackerras]

Michel Lanners writes:

> In the idle task, the processor (if supporting sleep) is put to either
> NAP or DOZE mode (see arch/ppc/kernel/idle.c). NAP mode seems to save
> more power, but there's no snooping. Don't know whether that would be a
> problem... but I guess it could. Anyway, if somebody wants to
> experiment, NAP can be enabled with
> /proc/sys/kernel/powersave-nap.

When I tried on my 1999 G3 powerbook, it seemed to be that it used
more power in nap mode than in doze mode, so I leave it in doze mode.

Paul.

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Paul Mackerras, Senior Open Source Researcher, Linuxcare, Inc.
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