Date: Sun, 20 Jul 2008 02:57:27 +0300 From: Giorgos Keramidas <keramida@ceid.upatras.gr> To: "Alexandre \"Sunny\" Kovalenko" <gaijin.k@gmail.com> Cc: freebsd-current@freebsd.org Subject: Re: Broken APIC on my laptop or bug in FreeBSD? Message-ID: <87iqv1h1g8.fsf@kobe.laptop> In-Reply-To: <1216508230.2172.8.camel@RabbitsDen> (Alexandre Kovalenko's message of "Sat, 19 Jul 2008 18:57:10 -0400") References: <87prpcjrsk.fsf@kobe.laptop> <1216501388.971.6.camel@RabbitsDen> <87mykd5wsl.fsf@kobe.laptop> <87tzelebd7.fsf@kobe.laptop> <1216508230.2172.8.camel@RabbitsDen>
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On Sat, 19 Jul 2008 18:57:10 -0400, "Alexandre \"Sunny\" Kovalenko" <gaijin.k@gmail.com> wrote: > On Sun, 2008-07-20 at 01:51 +0300, Giorgos Keramidas wrote: >> That was it. Thanks! >> >> # sysctl -a | egrep -e 'cx_(usage|support)' >> dev.cpu.0.cx_supported: C1/1 C2/1 C3/57 >> dev.cpu.0.cx_usage: 100.00% 0.00% 0.00% >> dev.cpu.1.cx_supported: C1/1 C2/1 C3/57 >> dev.cpu.1.cx_usage: 100.00% 0.00% 0.00% >> >> With anything except "C1" the CPU is obviously too slow to do >> anything useful :-) > > I guess it got worse in CURRENT: > > # uname -a > FreeBSD RabbitsDen.RabbitsLawn.verizon.net 7.0-STABLE FreeBSD 7.0-STABLE > #0: Wed Jul 9 16:52:35 EDT 2008 > root@RabbitsDen.RabbitsLawn.verizon.net:/usr/obj/usr/src/sys/TPX60 i386 > RabbitsDen# sysctl -a | egrep -e 'cx_(usage|support)' > dev.cpu.0.cx_supported: C1/1 C2/1 C3/57 > dev.cpu.0.cx_usage: 0.00% 100.00% 0.00% > dev.cpu.1.cx_supported: C1/1 C2/1 C3/57 > dev.cpu.1.cx_usage: 0.00% 4.43% 95.56% Now that I know what to look for, I see that what is reported in cx_supported is an array from the `struct acpi_cpu_softc' for each cpu. The initialization of per-cpu dev.cpu.*.cx_xxx values in the softc of the cpu is done in sys/dev/acpica/acpi_cpu.c:acpi_cpu_cx_cst(). I am probably not qualified to say if 'things got worse' in CURRENT, but I wish there was a way to find out *before* entering a state where the CPU is too slow to do basic tasks (i.e. time keeping, and scheduling processes).
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