Re: I/O APIC: AMD Errata #22 may be present.

[Mike Fowler <linux-smp@mlfowler.com>]

Ian,

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!

> Hi,
> 
> 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?
> 
> Thanks!
> 
> Ian
> 

[snip]
-- 
Mike Fowler
Registered Linux user: 379787

"I could be a genius if I just put my mind to it, and I,
I could do anything, if only I could get 'round to it"
-PULP 'Glory Days'