Benchmarking tools

[t.shantha.laxmi@exgate.tek.com]

Hi,
I am looking for some benchmarking tools for 
evaluating the performance of VxWorks/RTLinux/standard
linux on a PowerPC machine. Actually we are planning to
replace VxWorks with linux. I need to prove that standard 
linux/RTLinux can successfully replace VxWorks. 
Also, I need to decide whether to go for a standard
linux or an RTLinux. Has anybody conducted some 
benchmarking of this kind on a PowerPC  machine? If so,
could you please tell me what tools did you use for this 
purpose. 

Any help will be greatly appreciated,

- Shantha