Re: [Bug #12650] Strange load average and ksoftirqd behavior with 2.6.29-rc2-git1

Damien Wyart
2009-02-16T13:02:34Z

* Ingo Molnar <mingo@elte.hu> [090216 13:26]:
> We do get 0x100 which is 1 << RCU_SOFTIRQ, i.e. the RCU softirq. Paul,
> this indeed seems to be a CONFIG_TREE_RCU=y bug.

> What is weird is that RCU_SOFTIRQ gets set again and again - but there's
> no raise_softirq() calls. Could you please do a two-CPU trace too via:

> echo 3 > /debug/tracing/tracing_cpumask

> So that we can see what's happening on the other CPU?

> Also, could you please apply the debug patch below (or update to the
> very latest -tip tree), so that we get trace entries of softirq triggers
> too?

Ok, the new trace with these additional modifications is here:
http://damien.wyart.free.fr/ksoftirqd_pb/trace_tip_2009.02.16_1300_ksoftirqd_pb_abstime_proc_mask3.txt.gz

--
Damien