Messages in this thread | | | From | "Rafael J. Wysocki" <> | Subject | Re: System slow down from udev | Date | Thu, 30 May 2013 01:55:07 +0200 |
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On Wednesday, May 29, 2013 03:49:38 PM Yinghai Lu wrote: > On Wed, May 29, 2013 at 2:34 PM, Rafael J. Wysocki <rjw@sisk.pl> wrote: > > On Wednesday, May 29, 2013 01:13:46 PM Yinghai Lu wrote: > >> On Wed, May 29, 2013 at 4:29 AM, Rafael J. Wysocki <rjw@sisk.pl> wrote: > >> > On your systems the processor driver is built-in. Any chance to build it as > >> > a module and see if that helps? > >> > >> it CONFIG_ACPI_PROCESSOR it not set in the config > >> the boot get to normal speed. > > > > Well, if it is not set at all, there won't be problems with it. :-) > > > > I've tested my linux-next branch on OpenSUSE 11.3 both with the processor > > driver built in and modular and I'm not able to reproduce the issue you're > > seeing. > > > > Moreover, I'm not sure if user space is involved here at all, because the > > problem triggers for you when all of the relevant kernel code is non-modular. > > > > With the processor driver enabled, when the slowdown happens, are the systems > > usable enough to get some debug info out of them? > > please check the bootchart data. > > looks like it take 200s if no acpi_processor ... > otherwise will take 800s or more.
Well, something's fishy for sure.
To my eyes it looks like we're getting lots of notifications related to the processor driver and that generates a lot of workqueue load.
Can you please get /proc/interrupts from both cases and the output of "find /sys/firmware/acpi/interrupts/ -print -exec cat {} \;"?
Also please send the output of "ls -l /sys/devices/system/cpu/cpu*" with the processor driver present.
Thanks, Rafael
-- I speak only for myself. Rafael J. Wysocki, Intel Open Source Technology Center.
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