epoll_wait on several Threads faster?

I am thinking of programming a tcp server based on epoll. To achieve the best performance i want to implement multi core support too. But during my researches the following question came up: Is it faster to call two epoll_wait()-Calls from two different threads, each observing their own file descriptors on a dual core? Or is this as fast as calling just one single epoll_wait() which observes all file descriptors?

Since the Kernel observes the file descriptors, i think it doens't matter how much threads i use on user space calling epoll_wait()?