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:0.022 / U:61.860 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site