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    SubjectRe: [patch] voluntary-preempt-2.6.9-rc1-bk12-R5
    > Lee Revell wrote:
    >> Ingo, here is a report from a user (Rui) of a problem that seems to
    >> have been introduced in Q5.
    > Ugh, I got Rui's address wrong in the first post, please use the one
    > above for any followups. Sorry.

    >Rui Nuno Capela wrote:
    >> I'm having some trouble with latest VP patches on my P4 HT/SMP box. The
    >> trouble is that since Q5 that I can't get my machine to boot reliably,
    >> if at all. It goes almost all through the init scripts to drop dead on
    >> the beach, so to speak. It just freezes completely somewhere before the
    >> login prompts.
    >> This only happens if the kernel is configured for SMP/SMT
    >> (HyperThreading). The very same kernel configured and built for UP
    >> boots and runs fine. As I said before this was introduced on the Q5
    >> patch, and the same showstopper is present on latest R6. Only with Q3
    >> I'm still happy, altought only with softirq-preempt=0 AND
    >> hardirq-preempt=0.
    >> The "offending" box is a SUSE 9.1 based one, P4 2.80C HT on a ASUS
    >> P4P800 mobo, 1GB DDR.
    > I posted the above report to LKML and cc'ed you and Ingo. None of the
    > LKML testers are reporting this problem, it sounds very similar to the
    > problems others have had with SMP/HT but those were thought to all be
    > solved.

    Thanks Lee. Yes I was pretty excited with those reports too (I've been
    lurking on LKML :), but I just seem to be unlucky. That's why I've been
    trying one by one of the patches, from Q5 to R6 and tweaking the available
    options as much as I know and time permitted.

    OK, could just someone with a P4 HT/SMP box hand me their working kernel
    .config file for me to try? That could be a good starting point, if not a
    plain baseline.

    > Has any version worked with softirq or hardirq preemption enabled? What
    > are the symptoms if you boot Q3 with either of the above enabled?

    On this box in question, softirq and hardirq-preempt options had NEVER
    lead to a stable SMP/HT system, ever since my first rehearsal with VP,
    which I think was around O3. UP is quite different, it works and always
    worked, as advertised :) FWIW, R6 is pumping hard on my laptop :)

    Q3-SMP doesn't pass the KDE 3.3 startup splash if I set softirq=1 or
    hardirq=1. The system just hangs. I still keep softirq-preempt=0 and
    hardirq-preempt=0 as my Q3-SMP kernel bootloader parameters though.

    Hope this gets cleared out. All I can do is offering my best efforts to
    dig this out, provided someone give me some hunch ;)

    Thank you all.
    rncbc aka Rui Nuno Capela

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