noapic doesn't quite work as advertised

Andy Arvai (arvai@scripps.edu)
Tue, 22 May 2001 20:58:10 -0700 (PDT)


Hi,

I've got a tyan s2520 motherboard (dual PIII + i840) which is having a
problem with APIC errors. I tried running with noapic, but there were
still errors, although fewer. Does anyone have any idea what is going
on? I'm running 2.4.4 and software raid5, which generates a lot of
interrupts.

Here are some of the APIC errors (with noapic):

May 21 12:38:31 rad kernel: APIC error on CPU0: 02(01)
May 21 12:42:31 rad kernel: APIC error on CPU0: 01(01)
May 21 12:42:31 rad kernel: APIC error on CPU1: 02(02)
May 21 12:43:13 rad kernel: APIC error on CPU0: 01(02)
May 21 12:43:13 rad kernel: APIC error on CPU1: 02(01)
May 21 13:48:19 rad kernel: SCSI disk error : host 3 channel 0 id 0 lun 0 return code = 8000002
May 21 13:48:19 rad kernel: [valid=0] Info fld=0x0, Current sd08:d2: sense key Aborted Command
May 21 13:48:19 rad kernel: Additional sense indicates Scsi parity error
May 21 13:48:19 rad kernel: I/O error: dev 08:d2, sector 56590336
May 21 13:48:19 rad kernel: interrupting MD-thread pid 1223
May 21 13:48:19 rad kernel: raid5: parity resync was not fully finished, restarting next time.

Here is /proc/interrupts to prove I'm really running with noapic:

CPU0 CPU1
0: 17760464 0 XT-PIC timer
1: 29525 0 XT-PIC keyboard
2: 0 0 XT-PIC cascade
3: 27416165 0 XT-PIC eth1
11: 188276091 0 XT-PIC aic7xxx, aic7xxx, aic7xxx, aic7xxx
12: 413496 0 XT-PIC PS/2 Mouse
14: 1137884 0 XT-PIC ide0
15: 1740847 0 XT-PIC ide1
NMI: 0 0
LOC: 17760053 17759969
ERR: 31

Right now I'm running with noapic and nosmp and so far this seems to
be working. I really would like to be able to use the second
cpu so any suggestion would be greatly appreciated.

Andy
arvai@scripps.edu
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