Currently I am working on the optimization options of my project. I am evaluating the impact of the CGG optimizations on a very significant performance parameter of a RTOS, the Context Switch time.
The context switch time is measured by working with 2 threads, one client and a server, the client sends a message to the server, the server increases the message value and sends the result back to the client, the operation involves 2 context switches and is repeated during one second time (the source is in the project).
Playing with the various options I saw that the settings can improve the kernel performance really much, the context switch time can go from 6.42μS down to 3.37μS depending on the various compiler/kernel options, the space/time trade offs are very interesting.
The results of my research are presented in this spreadsheet:
http://www.mechlab.net/files/Performance.ods
I hope you will find it useful.
