linux - How many socket connections possible?
Has anyone an idea how many tcp-socket connections are possible on a modern standard Linux server?

I achieved 1600k concurrent idle socket connections, and at the same time 57k req/s on a Linux desktop (16G RAM, I7 2600 CPU). It's a single thread http server written in C with epoll. Source code is on github, a blog here.
Edit:
I did 600k concurrent HTTP connections (client & server) on both the same computer, with JAVA/Clojure . detail info post, HN discussion: http://news.ycombinator.com/item?id=5127251 
The cost of a connection(with epoll):

application need some RAM per connection
TCP buffer  2 * 4k ~ 10k, or more
epoll need some memory for a file descriptor, from epoll(7)


Each registered file descriptor costs roughly 90
                bytes on a 32-bit kernel, and roughly 160 bytes on a 64-bit kernel. 

