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    SubjectRe: Dual XEON - >>SLOW<< on SMP
    On Thu, 2 Nov 2000, Chris Meadors wrote:

    > On 2 Nov 2000, Ulrich Drepper wrote:
    >
    > > I'm seeing this as well, but only with PIII Xeon systems, not PII
    > > Xeon. Every single timer interrupt on any CPU is accompanied by a NMI
    > > and LOC increment on every CPU.
    > >
    > > CPU0 CPU1
    > > 0: 146727 153389 IO-APIC-edge timer
    > > [...]
    > > NMI: 300035 300035
    > > LOC: 300028 300028
    >
    > You mean that isn't supposed to happen?
    >
    > CPU0 CPU1
    > 0: 8480192 7786028 IO-APIC-edge timer
    > 1: 3 1 IO-APIC-edge keyboard
    > 2: 0 0 XT-PIC cascade
    > 8: 0 0 IO-APIC-edge rtc
    > 13: 0 0 XT-PIC fpu
    > 23: 188915 191259 IO-APIC-level eth0
    > 28: 16 14 IO-APIC-level sym53c8xx
    > 29: 33655 33665 IO-APIC-level sym53c8xx
    > 30: 0 0 IO-APIC-level es1371
    > NMI: 16266140 16266140
    > LOC: 16266123 16266122
    > ERR: 0
    >
    > This machine isn't even a Xeon, just a PIII CuMine on a ServerWorks HeIII
    > chipset.
    >
    > I reported this on -test6 but got no replies. I'm now running -test10 and
    > still seeing it.
    >

    I sure home these ISRs are __tiny__. There is a large amount of
    overhead to an interrupt!

    CPU0 CPU1
    0: 3772079 3803111 IO-APIC-edge timer
    1: 32410 33467 IO-APIC-edge keyboard
    2: 0 0 XT-PIC cascade
    4: 4 2 IO-APIC-edge Analogic(tm) VXI Driver
    8: 0 0 IO-APIC-edge rtc
    10: 1089719 1091693 IO-APIC-level eth0
    11: 98093 96730 IO-APIC-level BusLogic BT-958
    13: 1 0 XT-PIC fpu
    NMI: 0
    ERR: 0

    My machine doesn't do any of that stuff but I'm not running the
    latest kernel (yet).


    Cheers,
    Dick Johnson

    Penguin : Linux version 2.2.17 on an i686 machine (801.18 BogoMips).

    "Memory is like gasoline. You use it up when you are running. Of
    course you get it all back when you reboot..."; Actual explanation
    obtained from the Micro$oft help desk.


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