Date: Tue, 29 Jan 2008 09:31:05 -0800 From: Nate Lawson <nate@root.org> To: Andriy Gapon <avg@icyb.net.ua> Cc: freebsd-acpi@freebsd.org Subject: Re: cx_lowest and CPU usage Message-ID: <479F62D9.6080703@root.org> In-Reply-To: <479F0ED4.9030709@icyb.net.ua> References: <479F0ED4.9030709@icyb.net.ua>
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Andriy Gapon wrote: > Report for 7.0-RC1 on quite old hardware: 440BX-based motherboard, > 450Mhz Pentium III (Katmai). > > cx_supported claims to support C1, C2, C3. If I set cx_lowest to C3 it > immediately gets backed out to C2 with a kernel message about too many > short sleeps. But that's not a problem. > There is a weird thing: if I change cx_lowest to C2 when the machine is > completely idle, top shows that CPU usage for interrupts immediately > jumps to almost 20%. Change cx_lowest to C1, CPU usage drops back to > almost 0%. > Is this normal ? > If not, does this indicate some problem in idle routine or is this just > incorrect statistics calculation ? Or maybe something with HW ? Leave it at C1. Apparently C2 and C3 don't work on your machine. That's understandable with older, non-laptop hw. -- Nate
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