Messages in this thread | | | Date | Wed, 26 Mar 2008 12:16:41 -0700 (PDT) | From | Christoph Lameter <> | Subject | Re: [PATCH 2/2] x86: Modify Kconfig to allow up to 4096 cpus |
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On Wed, 26 Mar 2008, Mike Travis wrote:
> I guess the main effect is that "MAXSMP" represents what's really > usable for an architecture based on other factors. The limit of > NODES_SHIFT = 15 is that it's represented in some places as a signed > 16-bit value, so 15 is the hard limit without coding changes, not > an architecture limit.
NODES_SHIFT also controls how many page flag bits are set aside for the node number. If you limit x86_64 to 512 nodes then lets keep this at 9.
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