I am bechmarking a server with intel xeon DP 3.6GHZ on a Brandon2 mother board. I wanted to check the performance of the machine with a single processor and i removed a processor leaving the setup with a single Xeon (Nocona)3.6 Ghz DP processor on board.
While running the intel optimised linpack benchmark on this setup to my surprise the result had a processor information with 2.72 Ghz. When i checked the /proc/cpuinfo in RHAS 4 update platform i was using the same frequency was available.
But the BIOS information shows a single processor with 3600Ghz. HT is enabled.
With linux both smp kernel and up kernel are showing the same cpu speed.
What could be the reason for this?