Date: Mon, 03 Nov 2008 11:16:04 +0200 From: Alexander Motin <mav@FreeBSD.org> To: "Alexandre \"Sunny\" Kovalenko" <gaijin.k@gmail.com> Cc: FreeBSD acpi <freebsd-acpi@freebsd.org>, freebsd-mobile@FreeBSD.org Subject: Re: Is the C3 possible with SMP? Message-ID: <490EC154.9020801@FreeBSD.org> In-Reply-To: <1225670686.1153.8.camel@RabbitsDen> References: <490DF584.5080506@FreeBSD.org> <1225656933.1202.2.camel@RabbitsDen> <490E245C.7070900@FreeBSD.org> <1225664813.1202.5.camel@RabbitsDen> <490E2D19.1030502@FreeBSD.org> <1225670686.1153.8.camel@RabbitsDen>
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Alexandre "Sunny" Kovalenko wrote: > When laptop is moving around with me, all USB modules are unloaded and I I will try to unload USB later today. > get about 4 hours of battery life with wireless on, admittedly on the > light usage (reading/writing E-mails, browsing web, typing up occasional > document). I consider this good for 4.4lbs (<2kg) laptop. I have a bit more then 3 hours at the same weight. Which CPU, video and chipset do you have? > OK, so we have C3. Is this the machine you see no difference in power > consumption between C3 and no C3? How did you measure it? Yes. I am using `acpiconf -i 0`. I have no way to measure AC power and I am not sure in precision of such measurements due to limited AC power supply effectiveness. I have some doubts that C3 on only one of two cores could give much benefit. I have already lowered frequency and voltage via EST by powerd. I have turned off most of CPU clocks with Core2Duo C2E state. So, according to what I have read, now only APICs and bus controller are active. As soon as I see timer interrupt on cpu1 it's APIC is not sleeping. Bus controller is shared by cores, so it can't be disabled until at least one core is active. -- Alexander Motin
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