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    SubjectRe: [Bugme-new] [Bug 7495] New: Kernel periodically hangs.
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    > I don't know. In fact I forget how I worked out that it worsened in
    > 2.6.early.
    >
    > google(noapic) gets 232,000 hits.

    is there a way to ask google "only stuff in the last year"?
    Asking because "noapic" in 2.4 was the standard "try this" answer when
    people had a bios that had busted MPS (but good ACPI)...


    > I don't think it really matters when or why it happened.

    well to some degree it does; if it's one patch causing it narrowing it
    down at least somewhat in time would help ;)

    > If we take the
    > approach of fixing one machine at a time, we'll only need to fix a few
    > individual machines to improve the situation for a lot of people.

    alternative is that more new machines showed up that need it somehow, eg
    not really a regression just something else. Different approach is
    needed for hunting that down. But to be realistic we need to narrow
    things down a bit, which means

    1) Only care about SMP machines. APIC on true UP (no
    Hyperthreading/Dualcore) is a thing no hardware vendor tests (Microsoft
    doesn't use it) and is just too likely to trip up SMM and other bad BIOS
    stuff.
    * exception is probably people who don't WANT to use apic but where it
    somehow gets used anyway; if that happens we probably have the magic
    bullet that causes the regression :)
    2) Only care about ACPI using kernels. Non-ACPI uses MPS tables for
    this, but most vendors hardly maintain those anymore at all and they are
    generally just /dev/random nowadays
    3) Ignore overclocking; if you overclock using the FSB the apic busses
    run out of spec as well; can be a huge timewaster in debug time.



    --
    if you want to mail me at work (you don't), use arjan (at) linux.intel.com
    Test the interaction between Linux and your BIOS via http://www.linuxfirmwarekit.org

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