Ok, so you have installed the real time kernel form Planet CCRMA but you feel that something is still compromising your low latency objectives. Well, this is touchy subject and it does have many variables, but with some research and some useful tools, you will gain the knowledge to have your Fedora machine running with acceptable latencies.
Real Time Tests & Tools
There are a two tools that I have found to use and further fine tune my system for real time audio use.
The first one is the real time configuration quick scan. You can download it here: http://code.google.com/p/realtimeconfigquickscan/ [1]
Follow the instructions on the site.
If you want to run a command line version of this helpful script, simply navigate to the directory
cd realtimeconfigquickscan
type
./realTimeConfigQuickScan.pl
and hit enter.
Now, if the scan reports that something is not optimized, it will not only tell you, but it will give you a link to http://wiki.linuxmusicians.com/doku.php?id=system_configuration [2]
I recommend running the command line version as the GUI version is still experimental.
Granted, all of the tests in this scan may not apply to you and your hardware, but this is where the real fun begins. And we all know that real fun can only happen in real time.