lkml.org 
[lkml]   [2008]   [Jan]   [6]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: 2.6.24-rc6-git12: Reported regressions from 2.6.23

    * Mark Lord <lkml@rtr.ca> wrote:

    > Rafael J. Wysocki wrote:
    >> This message contains a list of some regressions from 2.6.23 reported since
    >> 2.6.24-rc1 was released, for which there are no fixes in the mainline I know
    >> of. If any of them have been fixed already, please let me know.
    > ..
    >> Subject : 20000+ wake-ups/second in 2.6.24
    >> Submitter : Mark Lord <lkml@rtr.ca>
    >> Date : 2007-12-02 04:23
    >> References : http://lkml.org/lkml/2007/12/1/141
    >> http://bugzilla.kernel.org/show_bug.cgi?id=9489
    >> Handled-By : Arjan van de Ven <arjan@infradead.org>
    >>
    > ..
    >
    > I have only seen that one once, and I think it was Arjan who said that
    > it has been observed rarely by other people as well. The bugzilla
    > entry is mostly just to track the darned thing, but it seems unlikely
    > that anyone will find/fix it for 2.6.24. No big deal, but it would be
    > good to have somebody knowledgeable in clocks/interrupts try and track
    > it down.
    >
    > I wonder if it's just a babbling IRQ on resume, before the driver has
    > run it's resume code or something ?

    i've read the discussions, and i cannot see it analyzed anywhere _what_
    causes the wakeups. And how are these wakeups counted? Is this based on
    powertop output:

    Wakeups-from-idle per second : 20.4 interval: 1.8s

    ? Somewhere i saw it mentioned that "the CPU throws out of C mode". What
    does that mean - does it mean we try to idle again and again, but we
    immediately return from C mode - while this all looks like "idle" time
    to the scheduler (so 'top' will show lots of idle time), but the ACPI
    wakeup counters are going up like mad? What is /proc/interrupts doing
    when this happens - is any of the irq sources going upwards?

    Ingo


    \
     
     \ /
      Last update: 2008-01-06 10:57    [W:5.699 / U:0.040 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site