Hi, This commit shows that jenkins hash function(http://en.wikipedia.org/wiki/Jenkins_hash_function) is implemented in kernel : commit 60d509c823cca21e77d537bd356785f7cfe8f0d1 Author: Jozsef Kadlecsik <kadlec@blackhole.kfki.hu> Date: Fri Dec 3 02:39:01 2010 +0000 The new jhash implementation <snip> I could not find any good documentation describing how to use it. Only thing i could do is to read codes which uses it, like /net/netfilter/xt_NFQUEUE.c. I have got some idea about how it works. But a good documentation would have been better. Like this one describing linux's implementation of doubly linked list : http://isis.poly.edu/kulesh/stuff/src/klist/ It describes how i can use this even in user land code. If i could do this for jhash then the understanding would have been better. Cheers.