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    SubjectRe: 2.6.24-rc8-rt1: Strange latencies on mpc5200 powerpc - RCU issue?

    On Wed, 2 Jul 2008, Wolfgang Grandegger wrote:

    >
    > Steven Rostedt wrote:
    > > On Tue, 1 Jul 2008, Wolfgang Grandegger wrote:
    > >> 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.

    Hmm, should be. But I need to test it on my PPC box first before I can
    tell you for sure. If you don't see a way to enable it, perhaps I haven't
    updated the config options for PPC yet.

    -- Steve



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