I have a 24 Core Opteron 8435 system with 48GB of RAM. However, the performance is way below that of our 6 Core Intel with 30GB of RAM. I wonder if anyone could this of why? We're running a Drupal website off this box with mysql 5.0 installed on the same box. PHP 5.6.13 and Apache 2.2.9. Every now and then the response is quicker than lightening but most times it struggles. mpstat -P ALL shows little activity but it's almost like the apache children are having problem starting up but once started are fine? Is this a CPU cache issue?
My dmesg is at http://pastebin.com/KSWxqmJe