Messages in this thread | | | Date | Sun, 6 Jan 2008 10:55:01 +0100 | From | Ingo Molnar <> | Subject | Re: 2.6.24-rc6-git12: Reported regressions from 2.6.23 |
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* 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
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