On 06/18/2011 05:21 AM, Camaleón wrote:
On Fri, 17 Jun 2011 20:49:41 +0200, Armin Kneip wrote:
The computer OS running has 48-core CPU, but the OS now only can
recognize 32-core of CPU.
The kernel version is 2.6.26-2-amd64.
The current Debian kernel supports only 32 cpu's. Set CONFIG_NR_CPUS to
48 or higher and recompile your kernel.
True! :-o
sm01@stt008:~$ grep -i nr_cpus /boot/config-2.6.26-2-amd64
CONFIG_NR_CPUS=32
Where is that limit coming from? It must be a rationale for doing it so.
(searching...)
Ah, found this thread:
Debian stock kernel config -- CONFIG_NR_CPUS=32?
http://lists.debian.org/debian-user/2010/10/msg01391.html
Oops, no rationale then :-)
I hardly call "module size blows up" to be no rationale for limiting the
number of CPUs.
Why 32? Well, it's a nice power of 2 and lots more than the number of
cores in 99.9999% of all computers.
--
"Neither the wisest constitution nor the wisest laws will secure
the liberty and happiness of a people whose manners are universally
corrupt."
Samuel Adams, essay in The Public Advertiser, 1749
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