Steven Rostedt wrote:

On Tue, 1 Jul 2008, Wolfgang Grandegger wrote:

quoted

I continue this thread because it's still not understood why enabling
CONFIG_RCU_TRACE is necessary to get reasonable latencies on the
MPC5200. It might also explain, why I get much worse latencies with
2.6.25.8-rt7.

Have you tried turning on ftrace?

Hm, is it available for PowerPC? I have not found yet how to enable it.

Wolfgang.