Date: Tue, 27 Jan 2009 17:49:29 -0700 From: Shawn Badger <shawnbadger@gmail.com> To: Chuck Swiger <cswiger@mac.com> Cc: freebsd-questions@freebsd.org Subject: Re: Laptop battery life on FreeBSD Message-ID: <497FAB99.1050607@gmail.com> In-Reply-To: <2F8A37C3-178D-48CB-A17A-CBF6CAD86F60@mac.com> References: <497F9683.3080905@gmail.com> <2F8A37C3-178D-48CB-A17A-CBF6CAD86F60@mac.com>
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Chuck Swiger wrote: > On Jan 27, 2009, at 3:19 PM, Shawn Badger wrote: >> I'm somewhat of a minimalist and don't use X11. I've disabled the >> bluetooth adapter, but frequently use my wireless adapter (intel >> pro/2200bg). Does anyone have any suggestions that could potentially >> extend my battery life? > > Have you tried reducing HZ to 100 (put kern.hz="100" in > /boot/loader.conf and reboot)? > Are you running powerd? Look into "sysctl hw.acpi" and "sysctl > debug.cpufreq".... > > Regards, Thanks for the ideas Chuck. I lowered kern.hz to 100 as you suggested (does this affect the kernel's ability to track time in milliseconds? ie. if I want to run a benchmark using the 'time' utility?). And the output of the two sysctl queries is posted here: http://pastebin.com/m5ae8aa1c I'm not very familiar with acpi, so if you see anything that could be optimized, I'd appreciate the feedback. Shawnhelp
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