Re: [PATCH] dynamic tick patch

[Tony Lindgren]

* Arjan van de Ven <arjan@xxxxxxxxxxxxx> [050119 09:31]:
> On Wed, 2005-01-19 at 09:11 -0800, Tony Lindgren wrote:
> > * Pavel Machek <pavel@xxxxxxx> [050119 03:32]:
> > > Hi!
> > > 
> > > > As this patch is related to the VST/High-Res timers, there
> > > > are probably various things that can be merged. I have not
> > > > yet looked at what all could be merged.
> > > > 
> > > > I'd appreciate some comments and testing!
> > > 
> > > Good news is that it does seem to reduce number of interrupts. Bad
> > > news is that time now runs faster (like "sleep 10" finishes in ~5
> > > seconds) and that I could not measure any difference in power
> > > consumption.
> > 
> > Thanks for trying it out. I have quite accurate time here on my
> > systems, and sleep works as it should. I wonder what's happening on
> > your system? If you have a chance, could you please post the results
> > from following simple tests?
> 
> tsc is dangerous for this btw; several cpus go either slower or stop tsc
> entirely during hlt... eg when idle.
> I would suggest to not include a tsc driver for this (otherwise really
> cool) feature.

Yeah, I just started with what was running on my old box :)
I'll make it a separate Kconfig option with notes on that. The TSC
timer is currently as accurate as without dyn-tick, but the ACPI PM
timer's accuracy suffers a bit for some reason.

Tony
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