Date: Sun, 02 Nov 2008 20:46:28 +0200 From: Alexander Motin <mav@FreeBSD.org> To: FreeBSD acpi <freebsd-acpi@freebsd.org>, freebsd-mobile@FreeBSD.org Subject: Is the C3 possible with SMP? Message-ID: <490DF584.5080506@FreeBSD.org>
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Hi. I have tried to enable C3 state on my Core2Duo laptop and found that it is not working good. System HZ timer stops during CPU sleep. After some investigation I have found that it is due to LAPIC timer used for HZ stopped during C3 state (same as during AMD's C1E). So the question is: Is it possible (or planned) to make it work somehow? For example, by using some external timer instead of LAPIC's one? ACPI reports about 20% less idle power consumption with C3 state comparing to C2. It would be interesting to get additional half an hour on battery. -- Alexander Motin
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