Hi Sri,

PF Usage in Windows XP and Windows Server 2003 is actually the system commit total. This number represents potential page file usage, not actual page file usage. It is how much page file space would be used if all the private committed virtual memory in the system had to be paged out all at once.

System Perfmonace depends on many factors eg Memory, Processor ,Disk and load on server etc. I would say, performance monitor will be your friend here to check the system performance and bottle neck (If any).

To check physical memory usage you can use the following counters in performance monitor.

Memory\ Available Bytes   -> This counter could help you in find the available memory .If this value is less constantly then you need to update RAM.

Below two counters are for virtual memory usage.

Memory\ Pool NonPaged Bytes

Memory\ Pool Paged Bytes

Hope this will help you to understand how to proceed :)

Pawan