To know the version may be interesting but not really useful, I bet that if you change Redis with a dummy TCP server that is only able to reply +OK, whatever it receives, you'll get the same numbers here.
Basically every kind of networked server with a simple request-response protocol, in a busy loop over loopback, will show performances between 10k and 20k requests per second, mostly up to the speed of the implementation of the client.
Just curious if you were using reddis 2.0 or possibly 2.2 ? Also what version of the reddis client were you using? There were some performance improvements recently.
Edit: thanks for sharing your experience, even if your test wasn't done with the help of a nobel winning computer team, it can still be useful data.