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
    Hi!

    > Attached is the dynamic tick patch for x86 to play with
    > as I promised in few threads earlier on this list.[1][2]
    >
    > The dynamic tick patch does following:
    >
    > - Separates timer interrupts from updating system time
    >
    > - Allows updating time from other interrupts in addition
    > to timer interrupt
    >
    > - Makes timer tick dynamic
    >
    > - Allows power management modules to take advantage of the
    > idle time inbetween skipped ticks
    >
    > - Might help with the whistling caps?
    >
    > The patch should be non-intrusive where possible. The system
    > boots with the regular timers, and then later on switches on
    > the dynamic tick if the selected driver implements get_hw_time()
    > function.
    >
    > Currently supported timers are TSC and ACPI PM timer. Other
    > timers should be easy to add. Both TSC and ACPI PM timer
    > rely on the PIT timer for interrupts, so the maximum skip
    > inbetween ticks is only few seconds at most.
    >
    > Please note that this patch alone does not help much with
    > power savings. More work is needed in that area to make the
    > system take advantage of the idle time inbetween the skipped
    > ticks.

    Well, having HZ=100 instead of HZ=1000 has measurable benefits on
    power consumption. This should be at least as good, no?
    Pavel
    --
    People were complaining that M$ turns users into beta-testers...
    ...jr ghea gurz vagb qrirybcref, naq gurl frrz gb yvxr vg gung jnl!
    -
    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:0.023 / U:0.868 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site