http://blogs.gentoo.org/kingtaco?disp=comments en-US http://backend.userland.com/rss 60 Tue, 25 Aug 2009 21:08:14 +0000 lc [Visitor] c21992@http://blogs.gentoo.org/ The core is just marked as offline for the scheduler, which means it won't be allocated any thread. But the CPU is not "physically" shutdown. On a dual quad-core setup, offlining 6 of the 8 cores reduces consumption by 5-6 W in idle... http://blogs.gentoo.org/kingtaco/2006/10/09/cpu_fun#c21992 Tue, 12 Dec 2006 14:14:01 +0000 Lukasz [Visitor] c18523@http://blogs.gentoo.org/ Well, i checked energy consumption after disabling one of cpu's. On my laptop (core 2 duo - t7200) it's bigger than with both cores enabled ;/. I can't also hear a beeping from my machine, which can be heared when cpus (both cores) are idle. It seems, that disabled core is consumig as much energy as it can. So imo disabling one of cpus is just for fun. http://blogs.gentoo.org/kingtaco/2006/10/09/cpu_fun#c18523 Thu, 12 Oct 2006 16:00:59 +0000 KingTaco [Member] c18292@http://blogs.gentoo.org/ you can't disable the first CPU(on my box) I don't think disabling one core will have much effect on power consumption. the best way to find out is it get a wattmeter and have a good testcase(compile something big) http://blogs.gentoo.org/kingtaco/2006/10/09/cpu_fun#c18292 Wed, 11 Oct 2006 17:40:19 +0000 Brian Hall [Visitor] c18288@http://blogs.gentoo.org/ Have you been able to determine if shutting down a core with hotplug reduces power useage? I shut down one of the cores on my Optereon 165, but the core temperature did not drop (this was at idle). <br /> ]]> http://blogs.gentoo.org/kingtaco/2006/10/09/cpu_fun#c18288 Tue, 10 Oct 2006 19:03:54 +0000 Tomasz Wysocki [Visitor] c18286@http://blogs.gentoo.org/ Nice (-: Unfortunately I have only one CPU. Have you try to disable all CPUs? http://blogs.gentoo.org/kingtaco/2006/10/09/cpu_fun#c18286