Re: [BUG] Strange 1-second pauses during Resume-from-RAM

Ingo Molnar
2007-11-30T18:47:41Z

* Jörn Engel <joern@logfs.org> wrote:

> On Fri, 30 November 2007 14:43:12 +0100, Ingo Molnar wrote:
> >
> > http://redhat.com/~mingo/latency-tracing-patches/latency-tracing-v2.6.24-rc3.combo.patch
> >
> > does it work any better?
>
> It compiles. It boots with a 512M RAM (384M was too little with all
> the other debug options on). But it seems to lock up when running
> trace-cmd. On a rerun it locks up again, but with different output.

hm, you should decrease MAX_TRACE in kernel/latency_tracing.c from 1
million to 16K or so. 1 million entries probably depletes lowmem quite
seriously.

> Rerun was captured:
> http://logfs.org/~joern/trace1.jpg

hm, that looks weird. if you disable CONFIG_PROVE_LOCKING, does that
improve things? (or just turns a noisy lockup into a silent lockup?)

> I should do a couple of runs, but my girlfriend claims realtime
> priority for the evening.

yeah, SCHED_IDLE is not generally well received by them.

Ingo