Re: [PATCH][2.4] generic support for systems with more than 8 CPUs (2/2)

[William Lee Irwin III]

On Sat, Dec 21, 2002 at 10:59:10PM -0800, Pallipadi, Venkatesh wrote:
> 2/2 : switching to physical mode APIC setup in case of more than 8 CPU system
[...]
> -	printk("Enabling APIC mode: ");
> -	if(clustered_apic_mode == CLUSTERED_APIC_NUMAQ)
> -		printk("Clustered Logical.	");
> -	else if(clustered_apic_mode == CLUSTERED_APIC_XAPIC)
> -		printk("Physical.	");
> -	else
> -		printk("Flat.	");
> -	printk("Using %d I/O APICs\n",nr_ioapics);

IIRC NUMA-Q can be dynamically detected at boot by means of an MP OEM
table's presence, in particular if there's a matching string in the 8B
OEM record in the OEM table, with a value of "IBM NUMA" IIRC. This is
probably a line or two's worth of change to mpparse.c and declaring a
variable for clustered_apic_mode. If it were difficult to detect, I
wouldn't have suggested implementing it (though do so at your leisure). =)

I still think this is 2.5 material + backport once it gets testing there.

Bill