How do I configure my Linksys N-Router to my PS3 correctly?

So my router works fine with my playstation when my computer is off, but when my computer is on, when i try to play Black Ops for example, its like my router is giving my computer priority with my internet. How do i stop my router from doing that? I can't just tell people to get off the computer just because I want to play online. That ruins the purpose of the router.