Re: 2.2.15 driver OK on UP - no ints on SMP (SOLVED)

From: H. Peter Anvin (hpa@zytor.com)
Date: Fri Jul 07 2000 - 16:11:19 EDT

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    Followup to: <3964E2EB.C338FAB@timpanogas.com>
    By author: "Jeff V. Merkey" <jmerkey@timpanogas.com>
    In newsgroup: linux.dev.kernel
    >
    > Linus,
    >
    > When we were putting SMP on NetWare, we discovered that using the IOAPIC
    > hardware for UP systems was almost 4% faster than the 8259-PIC for LAN
    > drivers (since it has a dedicated ICC bus to pass interrupt messages to
    > a local APIC). Something to consider....
    >

    The problem is that most UP mobos don't *have* IOAPIC's... Linux will
    use them if they're there (most commonly on SMP mobos with only one
    slot populated, or on mobos which have UP and SMP versions.)

            -hpa 

    -- 
<hpa@transmeta.com> at work, <hpa@zytor.com> in private!
"Unix gives you enough rope to shoot yourself in the foot."
http://www.zytor.com/~hpa/puzzle.txt

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