Date: Sun, 02 Nov 2008 19:04:46 -0500 From: "Alexandre \"Sunny\" Kovalenko" <gaijin.k@gmail.com> To: Alexander Motin <mav@FreeBSD.org> Cc: FreeBSD acpi <freebsd-acpi@freebsd.org>, freebsd-mobile@FreeBSD.org Subject: Re: Is the C3 possible with SMP? Message-ID: <1225670686.1153.8.camel@RabbitsDen> In-Reply-To: <490E2D19.1030502@FreeBSD.org> References: <490DF584.5080506@FreeBSD.org> <1225656933.1202.2.camel@RabbitsDen> <490E245C.7070900@FreeBSD.org> <1225664813.1202.5.camel@RabbitsDen> <490E2D19.1030502@FreeBSD.org>
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On Mon, 2008-11-03 at 00:43 +0200, Alexander Motin wrote: > Alexandre "Sunny" Kovalenko wrote: > > You would not happen to have USB loaded or built into kernel? If you do, > > At home I have external USB keyboard and mouse, so yes, it is built in. > It would be difficult to unload and reload it each time I connect something. I am not sure, I follow. When my laptop is on my desk (and plugged into the power supply), I am loading usb modules for all the necessary devices, including, but not limited to my mouse and keyboard. At this point, I do not get much of C3: dev.cpu.0.cx_usage: 0.00% 100.00% 0.00% dev.cpu.1.cx_usage: 0.00% 99.76% 0.23% When laptop is moving around with me, all USB modules are unloaded and I 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. My Kill-A-Watt device shows miniscule (~4%) even if stable difference between C3 and no-C3 when plugged into the outlet. > > I have read in ICH8M datasheet about special feature of reducing USB > busmaster activity on idle periods to support C3 state. Do you know > something about it? Unfortunately, I do not. > > > you will practically never go into C3. What does > > > > sysctl dev.cpu | grep cx_usage > > > > say? > > %sysctl -a | grep cx_ > hw.acpi.cpu.cx_lowest: C2 > dev.cpu.0.cx_supported: C1/1 C2/1 C3/57 > dev.cpu.0.cx_lowest: C2 > dev.cpu.0.cx_usage: 0.00% 100.00% 0.00% > dev.cpu.1.cx_supported: C1/1 C2/1 C3/57 > dev.cpu.1.cx_lowest: C3 > dev.cpu.1.cx_usage: 0.00% 0.43% 99.56% > 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? -- Alexandre "Sunny" Kovalenko (Олександр Коваленко)
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