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    SubjectRe: 2.5.62-mjb3 (scalability / NUMA patchset)
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    Date
    On Wed, 2003-02-26 at 07:55, Martin J. Bligh wrote:
    > >> The patchset contains mainly scalability and NUMA stuff, and anything
    > >> else that stops things from irritating me. It's meant to be pretty
    > >> stable, not so much a testing ground for new stuff.
    > >>
    > >> I'd be very interested in feedback from anyone willing to test on any
    > >> platform, however large or small.
    > >>
    > >> ftp://ftp.kernel.org/pub/linux/kernel/people/mbligh/2.5.62/patch-2.5.62-
    > >> mjb 3.bz2
    > >>
    > >
    > > Martin,
    > >
    > > I have been seeing system hangs on my 16 processor numaq while running
    > > contest. The system will hang within a few seconds to half an hour.
    > > Unfortunately there is no stack trace or any other indication on the
    > > system console. I have been running your 2.5.62-mjb2 without problems
    > > previously. Any ideas what I can do to narrow this down?
    >
    > Humpf. Can you try backing out this patch (it caused me similar problems on
    > 59, but seemed fine in 62). I suspect it's just changing timing enough that
    > we hit some other bug ... if you could, would be nice to try the ALT+SYSRQ
    > stuff, or turn on NMI watchdogs and get a backtrace ... I've not been able
    > to reproduce this on recent kernels.
    >
    > Thanks,
    >
    > M.
    >
    > diff -urpN -X /home/fletch/.diff.exclude
    > 330-no_kirq/include/asm-i386/mach-numaq/mach_mpparse.h
    > 340-auto_disable_tsc/include/asm-i386/mach-numaq/mach_mpparse.h
    > --- 330-no_kirq/include/asm-i386/mach-numaq/mach_mpparse.h Fri Jan 17
    > 09:18:31 2003
    > +++ 340-auto_disable_tsc/include/asm-i386/mach-numaq/mach_mpparse.h Mon Feb
    > 24 08:14:42 2003
    > @@ -32,6 +32,7 @@ static inline void mps_oem_check(struct
    > if (mpc->mpc_oemptr)
    > smp_read_mpc_oem((struct mp_config_oemtable *) mpc->mpc_oemptr,
    > mpc->mpc_oemsize);
    > + tsc_disable=1;
    > }
    >
    > /* Hook from generic ACPI tables.c */
    >

    I turned on NMI watchdogs and when the system hung, I saw no output. My
    serial console is through a terminal server that isn't set up to pass
    along the sysrq, so I need to get this fixed. In any case I backed out
    the patch that you suggested and I have had no system hangs since.

    Mark.
    --
    Mark Haverkamp <markh@osdl.org>

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