Date: Sun, 12 Sep 2010 13:57:21 +0300 From: Alexander Motin <mav@FreeBSD.org> To: Norikatsu Shigemura <nork@FreeBSD.org> Cc: FreeBSD-Current <freebsd-current@FreeBSD.org>, Andriy Gapon <avg@icyb.net.ua> Subject: Re: CPU C-state storange on Panasonic TOUGH BOOK CF-R9 Message-ID: <4C8CB211.6020308@FreeBSD.org> In-Reply-To: <4C8CAD7D.50602@FreeBSD.org> References: <4C8BCAC5.5050008@root.org> <mailpost.1284277196.1767764.83548.mailing.freebsd.current@FreeBSD.cs.nctu.edu.tw> <4C8C8B64.8020907@FreeBSD.org> <20100912182625.c49d3f1d.nork@FreeBSD.org> <4C8C9F06.4090505@icyb.net.ua> <20100912190537.621e357e.nork@FreeBSD.org> <20100912190952.8c0d5726.nork@FreeBSD.org> <20100912192518.e791c191.nork@FreeBSD.org> <4C8CAC01.70004@icyb.net.ua> <4C8CAD7D.50602@FreeBSD.org>
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Alexander Motin wrote: > Andriy Gapon wrote: >> acpi_lid0: Lid closed >> em0: Link is up 1000 Mbps Full Duplex >> PROCESSOR-0722 [402244] cpu_cx_cst : acpi_cpu0: Got C2 - 245 latency >> PROCESSOR-0722 [403097] cpu_cx_cst : acpi_cpu1: Got C2 - 245 latency >> PROCESSOR-0722 [403855] cpu_cx_cst : acpi_cpu2: Got C2 - 245 latency >> PROCESSOR-0722 [405022] cpu_cx_cst : acpi_cpu3: Got C2 - 245 latency >> >> Maybe because of this? >> It seems like you do something and ACPI disables C3, leaving only C2/ > > One strange thing. During boot it can be seen: > acpi_cpu0: Got C2 - 205 latency > acpi_cpu0: Got C3 - 245 latency > , but after boot in sysctl we can see: > dev.cpu.0.cx_supported: C1/3 C2/245 > > It respecting latency it looks like not C3 got lost, but C2. AFAIR, > sysctl numbers C-states completely abstract, just as array indexes. So > thing reported as C2 could instead be C3, while C2 is absent for some > reason. BTW, have you tried to unplug power? My laptop hides C3 state when power cord is plugged-in. -- Alexander Motin
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