Very frustrated...so many opinions

[BehaartesEtwas]

I agree with distant. simply try it out and don't give up immediately if the result is not optimal. try different kernels, but maybe you are already fine with the one you got.

what kind of xeon is it? xeon is the name for all server cpus since several cpu generations...

(btw: on the RT kernel, srcds shouldn't have the highest priority, the timer interrupts should have a higher priority but everything else a lower)