On Wednesday 23 July 2008 21:52, Bodo Eggert wrote:
It's not always that simple. If you code drivers or network protocols,
it might seem easy, but a lot of the VM for example is riddled with
rather arbitrary heuristics. Suppose we do slab cache reaping at 1HZ
(for no really good reason)... what I want to do with that guy is to
get maximum power savings when the CPU is idle, however I don't want to
wait infinitely long because that's leaving work to do when the CPU
finally does wake up, and it also ties up memory. I want the minimum
timeout that gives maximum power saving (say, within 99.9% of theoretical
maximum).
Can you tell me how to achieve this, or do you have lawn to mow too? ;)
OK, today we probably just add a few seconds of slop and forget about it,
but actually in future if we might want to power down most of the system
between key strokes, we might want 10s of seconds of sleep time.
--
