How many individual processors does 32-bit Ubuntu 11.10 support?

[dkzhaos]

Hi,

I installed 32 bit Ubuntu 11.10 on two Servers, which each one has a 6-core Xeon X5675 3.07GHz cpu. I suppose to have 12 processors for each 6-core cpu, but I only can see 8 processors. I knew Ubuntu 11.10 kernel will detect the number of processors (or processor cores) . I don't have any idea why I cannot see all 12 processors. I really appreciate your reply. Thanks!

[Slim Odds]

Hi,

I installed 32 bit Ubuntu 11.10 on two Servers, which each one has a 6-core Xeon X5675 3.07GHz cpu. I suppose to have 12 processors for each 6-core cpu, but I only can see 8 processors. I knew Ubuntu 11.10 kernel will detect the number of processors (or processor cores) . I don't have any idea why I cannot see all 12 processors. I really appreciate your reply. Thanks!
You should most certainly use the 64 bit version of Ubuntu.

More info: https://answers.launchpad.net/ubuntu/+question/9820

[dkzhaos]

You should most certainly use the 64 bit version of Ubuntu.

Thank you for your reply! Yes, I know. But for some performance issues, I have to use 32 bit version for now. I don't find any offical documents talk about the maximum number of individual processors the 32-bit Ubuntu support, and I don't think 32 bit version of Ubuntu only support 8 processors.

[Slim Odds]

Thank you for your reply! Yes, I know. But for some performance issues, I have to use 32 bit version for now. I don't find any offical documents talk about the maximum number of individual processors the 32-bit Ubuntu support, and I don't think 32 bit version of Ubuntu only support 8 processors.

Please see link added to my previous post

[dkzhaos]

Please see link added to my previous post

Your link did not answer the question.

[dkzhaos]

Hi,

I installed 32 bit Ubuntu 11.10 on two Servers, which each one has a 6-core Xeon X5675 3.07GHz cpu. I suppose to have 12 processors for each 6-core cpu, but I only can see 8 processors. I knew Ubuntu 11.10 kernel will detect the number of processors (or processor cores) . I don't have any idea why I cannot see all 12 processors. I really appreciate your reply. Thanks!

[howefield]

Threads merged.

Please do not post duplicate threads.

[Slim Odds]

It looks like Ubuntu limits the 32 bit version to 8 cores....

http://ubuntuforums.org/showthread.php?t=1226102

Again, for a server you should really be using 64 bit.

Your other choice is to compile a custom kernel