Re: [RFC] 4-level page table directories.

From: Jack Steiner <>
Date: 2005-11-10 11:23:30
On Thu, Nov 10, 2005 at 01:03:44AM +0100, Gerald Pfeifer wrote:
> On Wed, 9 Nov 2005, Luck, Tony wrote:
> > But don't you already have that issue with persuading them to ship with 
> > CONFIG_NR_CPUS=16384?  Surely there are a whole boatload of tuneables 
> > and patches needed to get this sized system up and running? 4-level 
> > pagetables are just one piece of the puzzle.
> Is it possible you are mixing up MAX_NUMALINK_NODES (the maximum
> system size, i.e., the maximum number of nodes in a numalink domain)
> with CONFIG_NR_CPUS (the maximum SSI size)?
> I'm pretty confident SGI has not proposed setting CONFIG_NR_CPUS=16384
> to any OSV. ;-)
> Gerald

True, nothing this big is proposed for inclusion in SLES. The current max
for NR_CPUS is 1024. 

MAX_NUMALINK_NODES is the number of nodes in all SSI clusters that are 
connected by NUMALINK. Single kernels are still restricted to 256 
nodes & 1024 cpus.


Jack Steiner (          651-683-5302
Principal Engineer                      SGI - Silicon Graphics, Inc.

To unsubscribe from this list: send the line "unsubscribe linux-ia64" in
the body of a message to
More majordomo info at
Received on Thu Nov 10 11:24:14 2005

This archive was generated by hypermail 2.1.8 : 2005-11-10 11:24:21 EST