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    SubjectRe: 2.6.24-rc8-rt1: Strange latencies on mpc5200 powerpc - RCU issue?
    Hi Wolfgang,
    On Wed, Jul 09, 2008 at 03:15:01PM +0200, Wolfgang Grandegger wrote:
    > Hi Fu (without n)
    >
    ....
    > OK, in the past you have been able to reproduce the high latencies with
    > 2.6.24-rt1 and CONFIG_RCU_TRACE disabled, IIRC. Did you use a different
    > toolchain at that time?
    >

    Nope. As mentioned above, trace_mark() does some "real" works (what ever it is.),
    while the new mechahnismen use flags to remember the state of preemption. Maybe
    something here got optimized away? I take for grant, that you use gcc in your
    toolchain. Which version do you have?

    cheers
    Fu
    --
    Dipl.-Ing. Luotao Fu | Phone: +49-5121-206917-3
    Pengutronix - Linux Solutions for Science and Industry
    Entwicklungszentrum Nord http://www.pengutronix.de

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