i386/43491: microuptime () went backwards
simonw at matteworld.com
Thu May 1 10:20:08 PDT 2003
> Just to add to the record, I have seen this to also be part
> of the effects of a broken SCSI drive, apparently with the drive's
> electronics gone stale. Sometimes just a massive stream of the
> above microuptime()... messages whenever the disk was accessed,
> and after some time (but not always) followed by a total lockup
> with a bus reset every second (but sometimes just thousands of
> microuptime() messages, system was going normal apart from that,
> except for time+date and the logfile filling, of course.)
> Removing the drive fixed that.
I've noticed that the errors sometimes correspond to
heavy disk use (on either of its two disks), but I am
not seeing bus resets and the disks otherwise seem fine.
I can clear the condition by setting the i8254 frequency
with sysctl -w machdep.i8254_freq, even if I don't actually
change the frequency. I've also noticed this message on
APIC_IO: MP table broken: 8259->APIC entry missing!
so I suspect my problem is related to APIC interrupts.
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