Date: Tue, 29 Jan 2008 13:32:36 +0200 From: Andriy Gapon <avg@icyb.net.ua> To: freebsd-acpi@freebsd.org Subject: cx_lowest and CPU usage Message-ID: <479F0ED4.9030709@icyb.net.ua>
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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 ? -- Andriy Gapon
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