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    SubjectRe: APIC error on CPUx
    Hi,


    I also have this [a similar] message; it is produced repeatedly between 2.5
    and 5 seconds whenever the ISDN card is dialled in:
    May 22 14:28:18 shanghai kernel: APIC error on CPU0: 02(02)

    Linux shanghai 2.6.17-rc4 #1 Sat May 20 00:06:16 CEST 2006 i686 athlon
    i386 GNU/Linux



    >>>>>Debian 3.1
    >>>>>Linux mailserver 2.6.8-3-686-smp #1 SMP Thu Feb 9 07:05:39 UTC 2006 i686
    >>>>That's an ancient kernel.
    >>>Yes, I agree.
    >>> ... but the latest in Debian/Sarge. :-)
    >>>Do you, Andi, thing that upgrade to latest vanilla one ( from
    >>>kernel.org ) should solve this problem ?
    >>Probably not.
    >>>>
    >>>>>GNU/Linux
    >>>>>Hardware:
    >>>>>Intel SR1200
    >>>>>
    >>>>If it's an <=P3 class machine: most likely you have noise on the APIC bus.
    >>>>
    >>>Yes, you are right :
    >>>cat /proc/cpuinfo
    >>>...
    >>>model name : Intel(R) Pentium(R) III CPU family 1133MHz
    >>>...
    >>>
    >>>"Noise on APIC bus" means - " a lot of interrupts from devices" ?

    Yep.

    14:29 shanghai:~ > (while :; do cat /proc/interrupts |grep -i hisax; sleep
    1; done)
    193: 1111340 IO-APIC-level SiS SI7012, HiSax
    193: 1113106 IO-APIC-level SiS SI7012, HiSax
    193: 1114857 IO-APIC-level SiS SI7012, HiSax
    193: 1116599 IO-APIC-level SiS SI7012, HiSax
    193: 1118328 IO-APIC-level SiS SI7012, HiSax
    193: 1120093 IO-APIC-level SiS SI7012, HiSax
    193: 1121858 IO-APIC-level SiS SI7012, HiSax
    193: 1123608 IO-APIC-level SiS SI7012, HiSax
    (Hisax: CONFIG_HISAX_NETJET=y)

    The problem goes away with noapic or acpi=off, but of course that also
    means you don't have IRQs > 15.

    >>Usually a crappy/broken/misdesigned motherboard.

    Elitegroup L7S7A2 here.

    >And, probably, the latest question related to this topic:
    >
    >Can "noapic" or "nolapic" solve this ? Does it mean ( with these
    >parameters ) that devices will start to use 8259 interrupt controller
    >instead APIC ?
    >
    >Is harmfull put "noapic" on "nolapic" to cmdline ?


    Jan Engelhardt
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