One good technique is to run benchmarks of system operation. For example lmbench 
before and
after.
Essentially, RTL overhead is very small, but the application tasks can use as much of 
processor time
as you give them.

On Thu, May 03, 2001 at 02:16:42PM +0200, Peter Gehring wrote:
> Hello,
> 
> i?m looking for some methods/tools measuring the system/processor load, caused by 
>RT-Linux itself and the RT-Linux Tasks. TOP or PS only shows the real Linux 
>process/system-information.
> 
> The information i?m looking for is "How much processor perfomance will be available 
>for Standard Linux Applikation, if RT-Linux is running?"
> 
> We need the information in order to decide to introduce RT-Linux in our existent 
>Linux-System.
> 
> Thanks in advance
> 
> Peter 
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