OpenLISP is an open source implementation of the LISP Protocol running in the kernel of the FreeBSD Operating System. OpenLISP focuses on the data plane operation, meaning that it implements the LISP-Cache and the LISP-Database in the kernel space, as well as the encaps/decap functions. Everything that is related to the control plane is meant to run in the user space. OpenLISP does not provide any specific control plane protocol implementation (i.e., no mapping distribution protocol is provided). Rather OpenLISP implements a new type of sockets, called the Mapping Sockets providing an API that can be used by any users space process.
>>8
Lists are poor data structures for modern cache coherent shared memory architectures. And Lisp machines are poor uses of transistors, you can do more with the same amount of transistors if you use them for something other than implementing a Lisp machine.
Linear arrays and multi-dimensional multiplexing hardware (ie. GPUs) with programmable DSP filtering is the new hotness.