Re: [CentOS] smp falls back to up mode on quad core

Julian Echave wrote:

Hi,

I'm running Centos 5.1 on an Intel Quad 2 Core with four Q6600 processors. Despite Centos 5 supporting multiple cores (SPM), it doesn't seem to work for me:

1. a dmesg shows that only one processor is seen: "SPM alternatives: switching to UP code", etc.
2. file /proc/cpuinfo shows only one processor
3. top with option 1 (to toggle between seeing all processors or an

average) shows only 1 processor.

I've googled this, and other people have found this kind of trouble, but I was not able to find any solutions.

it might help diagnose this if you paste the output of 'dmesg' at least up to that "SMP Alternatives" message and maybe a couple more lines after it...