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Re: Debian stock kernel config -- CONFIG_NR_CPUS=32?

On 10/22/2010 07:08 PM, Andrew Reid wrote:
On Friday 22 October 2010 03:22:02 Sven Joachim wrote:
On 2010-10-22 03:15 +0200, Andrew Reid wrote:
   I recently deployed some new many-core servers at work, with
48 cores each (4x 12 core AMD 6174s), and ran into an issue where
the stock Debian kernel is compiled with CONFIG_NR_CPUS=32,
meaning it will only use the first 32 cores that it sees.

For the record, CONFIG_NR_CPUS has been increased to 512 (the maximum
supported upstream) in Squeeze.

   This is good to know.  When I built my own 2.6.26, I also
noticed that the maximum value offered by the configurator
was 256 -- we'll likely be seeing systems with that many cores
within a few years, if current trends continue.

Bah, humbug.

Instead of a quad-core at lower GHz, I just got my wife a dual-core at higher speed.

Seek truth from facts.

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