Hey, First time post here. Hopefully this is the right forum. We are seeing some very weird CPU usage numbers on the exact same software running on a X5560 and X5660 system. The server in question is a udp request/response server. On the older gen Dell systems with the X5560 processor, we typically see the process using on the order of 4-5% cpu for a unit of load. For the very same unit of load, the new Dell systems with the X5660 system uses 20-25% CPU. I am baffled about why this is happening. I have tried to use oprofile to see if there is a different pattern but see a similar pattern between the 2 systems, just that the newer system is using a lot more cycles.
Anyone have any ideas on what might be happening? Sridhar P.S Both systems run the same exact version of RHEL5.6