Kenel bypass & zero-copy

http://ttthebear.blogspot.com/2008/07/linux-kernel-bypass-and-performance.html

kernel bypass
http://www.networkworld.com/news/tech/2005/013105techupdate.html

zero-copy
http://lwn.net/2001/0419/kernel.php3http://www.linuxjournal.com/article/6345

Interrupt Coalescence
It is possible to reduce mean latency, but will most likely increase the min latency

RDMA
http://www.networkworld.com/news/tech/2003/0324tech.html
http://www.networkworld.com/newsletters/lans/2002/01556276.html

Request completions might be processed either entirely in user space (by polling a user-level completion queue) or through the kernel in cases where the application wishes to sleep until a completion occurs.

A Fast Read/Write Process to Reduce RDMA Communication Latencyhttp://www.people.vcu.edu/~xhe2/publications/Conferences/FRRWP_NAS06.pdf

--- implementation of user-space waiting on rdma ---
create a condition variable based on a futex
have rdma completion handler wake the condition variable