Performance testing of a functional module

Hi
Based on the input and corresponding expected output parameters we will test a particular functional module
Here how to check the performance of that functional module
Output is correct,but is there any standard specified timelimit  for the runtime , Load or it depends upon the complexity of that funct mod.
Please provide some inputs regarding this
Regards
Amuthan M

http://www.javaperformancetuning.com/tips/webservice.shtml

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