lkml.org 
[lkml]   [2005]   [Jul]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH] i386: Selectable Frequency of the Timer Interrupt
    >> Len Brown, a year ago: "The bottom line number to laptop users is
    >> battery lifetime. Just today somebody complained to me that Windows
    >> gets twice the battery life that Linux does."
    >
    > It seems the motivation for lower HZ is really:
    >
    > (1) ACPI/SMM suckage in laptops
    >
    > (2) NUMA systems with *horrible* remote memory latencies

    It makes a difference on more normal SMP systems as well, just not as
    much. See earlier in the thread. The NUMA system I used as an example
    was actually a newer one with something like a 4:1 ratio, not an older
    one with 20:1 or so. I have a feeling it's more to do with the number
    of procs and the scheduler being invoked more than it is really to do
    with NUMA ratios.

    It seems people are agreed we want sub-HZ timers, and eventually go
    to tickless ... the question is more what to do in the meantime.

    M.

    -
    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: 2005-07-13 23:40    [W:0.025 / U:0.900 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site