SMP kernel but no SMP detected on Tyan S2515

[John Baldwin]

On Thursday 17 November 2005 12:23 am, Mark Kirkwood wrote:
> John Baldwin wrote:
> > On Wednesday 16 November 2005 02:17 am, Mark Kirkwood wrote:
> >>This has me puzzled:
> >>
> >>I have a 2 cpu S2515 that has had SMP added to the kernel - however upon
> >>reboot the 2nd cpu is not detected (It is detected by the BIOS BTW). I
> >>see the following in the verbose dmesg:
> >>
> >>APIC: Could not find any APICs.
> >>
> >>I am guessing that it is turned off in the BIOS (???), if so, I've no
> >>idea where it is (AMIBIOS is my least favorite...).
> >>
> >>I have enclosed a verbose dmesg and my kernel differences from GENERIC
> >>plus the (non-existent) output from mptable.
> >>
> >>
> >>Any ideas appreciated.
> >
> > You're going to need to fiddle with the BIOS until mptable(8) finds a
> > valid MP Table.  The kernel relies on the MP Table to enumerate CPUs and
> > route interrupts.  You can also try enabling ACPI if your machine
> > supports ACPI.
>
> Ok - will do. I
>
> One other point, the cpus are both PIII SL52R (1000/256/133/1.75V), but
> they don't appear to be a matched pair (one is made in Malay, the other
> somewhere else - the heatsink is over it...) would this matter?
>
> Another possibility is that one of the cpus is faulty - should mptable
> show anything if one cpu is not "really" going (or for that matter if I
> remove one of 'em)?

It depends on your BIOS.  It generates the table, so it may choose to not 
provide the table if it thinks your CPUs are incompatible.

-- 
John Baldwin <jhb at FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve"  =  http://www.FreeBSD.org