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SubjectAPIC Errors with 2.4.2-pre1

First off, here's something from my dmesg.

mapped APIC to ffffe000 (fee00000)
mapped IOAPIC to ffffd000 (fec00000)
CALLIN, before setup_local_APIC().
ENABLING IO-APIC IRQs
...changing IO-APIC physical APIC ID to 2 ... ok.
init IO_APIC IRQs
IO-APIC (apicid-pin) 2-0, 2-9, 2-10, 2-11, 2-20, 2-21, 2-22, 2-23 not connected.
number of IO-APIC #2 registers: 24.
testing the IO APIC.......................
IO APIC #2......
....... : physical APIC id: 02
....... : IO APIC version: 0011
WARNING: unexpected IO-APIC, please mail
calibrating APIC timer ...
PCI->APIC IRQ transform: (B0,I7,P3) -> 19
PCI->APIC IRQ transform: (B0,I7,P3) -> 19
PCI->APIC IRQ transform: (B0,I10,P0) -> 17
PCI->APIC IRQ transform: (B0,I12,P0) -> 19
PCI->APIC IRQ transform: (B0,I13,P0) -> 18
PCI->APIC IRQ transform: (B0,I14,P0) -> 18
PCI->APIC IRQ transform: (B1,I0,P0) -> 16






Then whenever I do heavy CPU or RAM testing using something like cputest
and ubench, I get the following errors in my log..

APIC error on CPU0: 00(08)
APIC error on CPU1: 00(08)
APIC error on CPU1: 08(08)
APIC error on CPU1: 08(08)
APIC error on CPU1: 08(08)
APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
APIC error on CPU0: 08(08)
APIC error on CPU1: 08(08)
APIC error on CPU1: 08(08)
APIC error on CPU0: 08(08)
APIC error on CPU1: 08(02)
APIC error on CPU1: 02(02)
APIC error on CPU1: 02(08)
APIC error on CPU0: 08(02)
APIC error on CPU1: 08(01)
APIC error on CPU0: 02(02)
APIC error on CPU1: 01(02)
APIC error on CPU0: 02(02)
APIC error on CPU1: 02(04)
APIC error on CPU1: 04(04)
APIC error on CPU1: 04(02)
APIC error on CPU1: 02(08)
APIC error on CPU1: 08(02)
APIC error on CPU1: 02(02)


and on and on and on and on...


I found the error codes in /usr/src/linux/arch/i386/kernel/apic.c. I could
use a little help though on interpreting the error code(s) returned.

Also, from the source code I see that apic_read(APIC_ESR) is called.
In /usr/src/linux/include/asm/apicdef.h, I see that APIC_ESR is 0x280
which I take is the offset into the APIC_DEFAULT_PHYS_BASE.

Since this is a controller, I'd like to know what the ##(##) represent. I
take it that these numbers are the error code the controller reported just
before and just after the apic_write(). To me it looks like this was
done this way just to save state because the next thing called was the
ack_APIC_irq().

Can someone also please explain what the ESR is?


(Please forgive my ignorance of this stuff.)


--
David D.W. Downey - RHCE
Consulting Engineer
Ensim Corporation - Sunnyvale, CA

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