Re: I/O APIC: AMD Errata #22 may be present.
Mike Fowler <linux-smp <at> mlfowler.com>
2005-10-25 10:48:07 GMT
I hava two Athlon MP 1.4 processors with the same errata present. I've
used the noapic option without any "noticeable" performance loss. I say
"noticeable" as I have not done any performance tests to qualify that
statement, but it certainly hasn't hindered me in any way.
Hope this helps!
> I have an Appro 1124s server with a Tyan Thunder K7 S2462 motherboard,
> two AMD Athlon MP 1600 processors, the 760 MP chipset, and a single
> PCI device that is an Adaptec 2100S SCSI RAID controller (on a PCI
> riser/adapter of unknown origin). I've just upgraded to 2.6.13, and
> occasionally my server fails to boot. It seems to hang at this line:
> I/O APIC: AMD Errata #22 may be present. In the event of instability
> try booting with the "noapic" option.
> That line is however present in my kernel messages even on a
> successful boot. My entire dmesg from a successful boot,
> /proc/interrupts, and proc/cpuinfo are below.
> I've read Documentation/i386/IO-APIC.txt and have a vague
> understanding of what it means. I will certainly try the noapic
> option to see if things settle down, but is there any real world
> performance loss in doing so? Should I be looking into using "...the
> pirq= boot parameter to 'hand-construct' IRQ entries"? Is there
> anything else I could do to help squash this bug?