Date: Thu, 27 Mar 2003 23:54:28 -0700 (MST) From: "M. Warner Losh" <imp@bsdimp.com> To: kris@obsecurity.org Cc: current@freebsd.org Subject: Re: ACPI using too much CPU on idle system Message-ID: <20030327.235428.101835830.imp@bsdimp.com> In-Reply-To: <20030328043524.GA18639@rot13.obsecurity.org> References: <20030324212040.GF2462@rot13.obsecurity.org> <20030328043524.GA18639@rot13.obsecurity.org>
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In message: <20030328043524.GA18639@rot13.obsecurity.org>
Kris Kennaway <kris@obsecurity.org> writes:
: On Mon, Mar 24, 2003 at 01:20:40PM -0800, Kris Kennaway wrote:
: > top -S shows the following on my machine:
: >
: > CPU states: 0.8% user, 0.0% nice, 80.3% system, 12.9% interrupt, 6.1% idle
: >
: > PID USERNAME PRI NICE SIZE RES STATE TIME WCPU CPU COMMAND
: > 11 root -16 0 0K 12K RUN 563:23 32.23% 32.23% idle
: > 7 root -84 0 0K 12K actask 1:33 18.51% 18.51% acpi_task2
: > 5 root -84 0 0K 12K actask 1:33 18.21% 18.21% acpi_task0
: > 6 root -84 0 0K 12K actask 1:33 17.82% 17.82% acpi_task1
: > 21 root -68 -187 0K 12K WAIT 0:55 4.98% 4.98% irq9: fxp0 atapci0*
: > 17 root -24 -143 0K 12K WAIT 0:06 0.83% 0.83% swi6: acpitaskq
: >
: > The machine is supposedly idle..no process, disk or network activity,
: > so I can't see any reason for all this kernel CPU activity. What is
: > going on? Is this some kind of software-emulated CPU step-down
: > because ACPI has decided my CPU is too fast? :)
:
: Hello, ACPI people? I haven't had any response to this yet.
I've seen this on a dying battery on my Dell i8000. From time to
time, it just eats lots of CPU trying to get the battery's status.
Could also be a defective battery bay. But I see very similar
results.
Warner
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