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Asked by medent in Red Hat Linux, Linux Administration, Kernel And Operating System Specific Programming
Centos 5 is slower than Centos 4.5. I have an IBM x3850 with 64G ram 4 physical processors (16 total as seen by the OS) and an 8s raid controller and sas drives. I have a custom benchmark test which runs several instances of our server application test program which simulates a certain amount of medical progress notes being written, among other things, etc.
With Centos 4.5 the test completes in 18 minutes, but with Centos 5.0 (same server) the test completes in 40 minutes. The load average during the 4.5 test goes up to around 7, and the Centos 5.0 test load average peaks to only around 3. It doesnt seem like Centos 5.x is able to use its server resources very well. I quite sure its the kernel, becuase i also tried compiling the centos 5.0 kernel sources on 4.5x and running that 5.0 kernel on the 4.5 base and the results were slow (40 minutes) also.
Not sure where to go from here?
20091028-EE-VQP-87 / EE_QW_1_20070628