Date: Fri, 01 Feb 2008 18:05:52 +0200 From: Andriy Gapon <avg@icyb.net.ua> To: Nate Lawson <nate@root.org> Cc: freebsd-acpi@freebsd.org Subject: Re: cx_lowest and CPU usage Message-ID: <47A34360.2030105@icyb.net.ua> In-Reply-To: <479F62D9.6080703@root.org> References: <479F0ED4.9030709@icyb.net.ua> <479F62D9.6080703@root.org>
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on 29/01/2008 19:31 Nate Lawson said the following: > 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. > BTW, about C3: it seems that I have PCI_DEVICE_82371AB_3, PCI_REVISION_4E chip: intpm0@pci0:7:3: class=0x068000 card=0x00000000 chip=0x71138086 rev=0x02 hdr=0x00 But for some reason CPU_QUIRK_NO_C3 in acpi_cpu.c doesn't get reflected in cx_states. -- Andriy Gapon
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