Strange issue after early AP startup
John Baldwin
jhb at freebsd.org
Mon Jan 16 20:24:11 UTC 2017
On Monday, January 16, 2017 04:51:42 PM Hans Petter Selasky wrote:
> Hi,
>
> When booting I observe an additional 30-second delay after this print:
>
> > Timecounters tick every 1.000 msec
>
> ~30 second delay and boot continues like normal.
>
> Checking "vmstat -i" reveals that some timers have been running loose.
>
> > cpu0:timer 44300 442
> > cpu1:timer 40561 404
> > cpu3:timer 48462822 483058
> > cpu2:timer 48477898 483209
>
> Trying to add delays and/or prints around the Timecounters printout
> makes the issue go away. Any ideas for debugging?
I have generally used KTR tracing to trace what is happening during
boot to debug EARLY_AP_STARTUP issues.
--
John Baldwin
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