Re: gradual timeofday overhaul

[Len Brown]

On Tue, 2004-10-19 at 23:05, Tim Schmielau wrote:
> I think we could do it in the following steps:
> 
>   1. Sync up jiffies with the monotonic clock,...
>   2. Decouple jiffies from the actual interrupt counter...
>   3. Increase HZ all the way up to 1e9....

> Thoughts?

Yes, for long periods of idle, I'd like to see the periodic clock tick
disabled entirely.  Clock ticks causes the hardware to exit power-saving
idle states.

The current design with HZ=1000 gives us 1ms = 1000usec between clock
ticks.  But some platforms take nearly that long just to enter/exit low
power states; which means that on Linux the hardware pays a long idle
state exit latency (performance hit) but gets little or no power savings
from the time it resides in that idle state.

thanks,
-Len


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