Messages in this thread | | | Subject | Re: Timer unstability on when using C2 and deeper sleep states (Dell Latitude XT) | From | Andi Kleen <> | Date | Wed, 13 Aug 2008 22:17:36 +0200 |
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Milan Plzik <milan.plzik@gmail.com> writes:
> I apologize for replying on my own mail (and also for top-posting, but > this information is global update, not exactly fitting any of topics > mentioned below). > > After playing for a longer while I found out that the system ends > sometimes in state where, in order to do anything useful, I need to > press keys on keyboard.
This usually means it is using the wrong timer in a deeper idle state. Some idle states cannot be woken up by e.g. the APIC timer and then you get that effect: you only make progress when you wake up the CPU in some other way like pressing a key. Then on wake up the timers get processed.
This is usually a bug in the kernel timer selection. It should be chosing a timer that always wakes up from the deepest idle state used.
You should post the full boot log
-Andi
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