Strange 'hangs' with RELENG_9

[Andriy Gapon]

on 19/01/2012 23:47 László Károlyi said the following:
> On 2012.01.19., at 22:36, Andriy Gapon wrote:
> 
>> on 19/01/2012 23:24 László Károlyi said the following:
>>> On 2012.01.19., at 21:03, Andriy Gapon wrote:
>>>
>>>> László, can you please try changing kern.timecounter.hardware to TSC-low or
>>>> ACPI-fast?
>>>
>>> No result, the machine still does hang :( Tried all options.
>>
>> While you are there, can you try changing the eventtimer choice instead?  E.g.
>> to LAPIC.
> 
> Looks like this solved the hang problem. No system hang in the last 10 minutes.
> Shall i make a sysctl.conf entry to change this value by default, or what do you
> suggest?

You can do that via loader.conf or sysctl.conf.  The first option should be more
reliable.

What you see can mean two things (at least that's what I can think of):
- problems/quirks with HPET hardware on your system
- problems with IPI forwarding of time ticks between CPUs

Maybe there would be additional requests for debugging info if you are
interested in pursuing this further and are able to provide the info.

> I'll do a reboot now, to see if there will be a kernel panic at reboot, I
> compiled the kernel now with all the debug options. When it panicks, I'll post
> another screenshot of the console, this time a bigger one, as I managed to
> change the resolution of the console.


-- 
Andriy Gapon