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