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    SubjectRe: NO_HZ: timer interrupt stuck [Re: Linux 2.6.21-rc1]
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    On Thu, 2007-02-22 at 17:27 +0100, Pierre Ossman wrote:
    > Thomas Gleixner wrote:
    > >
    > > Here is the reason. The local APIC stops working in C3 state and we fall
    > > back to the PIT in that case. Not really exciting for dynticks, but the
    > > only way to keep the system alive. There is a patch coming up from
    > > Intel, which finds out how to use HPET even if it is not enabled by the
    > > BIOS. This will still end up on IRQ#0, but will give way longer idle
    > > sleeps than the PIT.
    > >
    > >
    >
    > So then the next two questions are; is it possible to disable C3

    yeah there is a commandline thingy for it
    > and is
    > it a net power gain to get rid of the wakeups in favor of having C3.

    no; c3 saves a TON more power.

    you can try enabling HPET in your BIOS...

    --
    if you want to mail me at work (you don't), use arjan (at) linux.intel.com
    Test the interaction between Linux and your BIOS via http://www.linuxfirmwarekit.org

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