Messages in this thread |  | | Subject | Re: NO_HZ: timer interrupt stuck [Re: Linux 2.6.21-rc1] | From | Arjan van de Ven <> | Date | Thu, 22 Feb 2007 17:42:06 +0100 |
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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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