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    SubjectRe: New pre-patch (Re: [PATCH] kswapd fully sysctl tunable)


    On Sun, 3 May 1998, Gerard Roudier wrote:
    >
    > > small patch that involves moving the "ack_APIC_irq();" inside
    > > arch/i386/kernel/irq.c: do_ioapic_IRQ() from the top of the function to
    > > the very bottom of that function (that will move it to outside the irq
    > > controller lock, but it should actually be perfectly ok in this case).
    >
    > If this will have the expected effect, this will be fine.
    > BTW, I cannot help for testing this stuff since I only have UP.

    Note that the apic code really isn't SMP-specific at all, and is valid on
    its own. It does have a strong link to SMP mainly because the MP table
    contains the PCI routing information, but even that really isn't a SMP
    issue.

    So if somebody feels interested, it might be a good idea to split up the
    _real_ SMP code from the code that should be merely "CONFIG_APIC". That
    would give it more wider testing - and the newer APIC makes sense even on
    UP if for no other reason than the fact that is is much lower latency.

    Linus


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