Re: Early hang with 2.6.21-rc4-rt1

Ingo Molnar
2007-03-30T09:02:43Z

* Roland Dreier <rdreier@cisco.com> wrote:

> Great, thanks ... I'm not sure which of the 2 patches fixed things,
> but I now got the following trace. I've not really analyzed this, but
> it definitely looks like tun_init() is doing something fishy...
> ("149776 us maximum-latency"!!)

best would be to enable FUNCTION_TRACING and to do:

echo 1 > /proc/sys/kernel/trace_enabled
echo 1 > /proc/sys/kernel/mcount_enabled

this will give you an exact trace of what happened, in
/proc/latency_trace.

Ingo