Piotr,

Most workers aren't blocking... they only block when they hit the db, and we are doing lots of caching. At its peak mysql is registering 140 requests per second. I've added more workers which has had no effect on the capacity going through nginx.. so either the DB itself is causing problems (unlikely since it is such a simple schema with no joins) or something is up with the nginx config.

Thanks for giving this some thought!

David