lkml.org 
[lkml]   [2005]   [Jan]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] dynamic tick patch
* Arjan van de Ven <arjan@infradead.org> [050119 09:31]:
> On Wed, 2005-01-19 at 09:11 -0800, Tony Lindgren wrote:
> > * Pavel Machek <pavel@suse.cz> [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
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 14:09    [W:0.067 / U:0.308 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site