Re: kacpi_notify_wq and kacpid_wq use a lot of cpu
From: Ali Gholami Rudi
Date: Fri Jan 22 2010 - 14:15:43 EST
Alexey Starikovskiy <astarikovskiy@xxxxxxx> wrote:
> > Sometimes kacpi_notify_wq and kacpid_wq workqueues use a lot of cpu.
> > I'm using yesterday's tip. At times kacpi_notify_wq uses 30-50% of
> > my cpu and kacpid_wq uses 3-5%:
> > # uptime
> > 12:49:54 up 4:16, 1 user, load average: 0.52, 0.55, 0.40
> > # ps -e | grep kacpi
> > 189 ? 00:00:52 kacpid
> > 190 ? 00:10:26 kacpi_notify
> > 191 ? 00:00:00 kacpi_hotplug
> > This sometimes happens after a few hours of uptime; so this is
> > very hard to bisect (by the way, I think the same thing causes
> > the fans to work fullspeed sometimes when I reboot the machine).
> > I tried this patch to find out which of the callers of
> > acpi_os_execute() is the culprit:
> > Is there something I can do to trace the problem? dmesg and lspci
> > are attached.
> Please open new bug at bugzilla.kernel.org, for ACPI.
> It would help if you provide name of your machine (make?)
This is a hp-compaq 610 laptop.
> and acpidump output.
Attached to the bugzilla report.
> Do you know the kernel, there this problem did not occur (is it a regression)?
The oldest kernel I tried on this machine was something after 2.6.32
and it had the same problem.
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