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    SubjectRe: 2.6.15-rt4 failure with LATENCY_TRACE on x86_64
    On Thu, 2006-01-12 at 22:18 -0500, Steven Rostedt wrote:
    > OK, I'm actually sending you this email on a x86_64 running
    > 2.6.15-rt4-sr2, with latency tracing on. But unfortunately, I have a
    > AMD X2 that each core has it's own tsc counter that is not in sync, and
    > since the latency tracer uses tsc, I get garbage. But beware, the tsc
    > does slow down when the cpu idles, so it gives bad results even for non
    > x2 systems.
    Hmm, I didn't realize that (I'm running on a uni-processor system). I
    just pulled your rt4-sr2 patch and will apply/rebuild/test.

    > I finally was able to boot this with using the PM timer, but the
    > beginning of my dmesg is still filled with:
    > read_tsc: ACK! TSC went backward! Unsynced TSCs?
    > Have you tried booting with idle=poll? I wonder if that would help?

    No, I thought that was strictly an SMP issue. I'll try it as well.


    Clark Williams <>
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