  We present the current status of APENet, our custom 3-dimensional
interconnect architecture for PC clusters environment. We report some
micro-benchmarks on our recent large installation as well as new developments
on the software and hardware side. The low level device driver has been
reworked by following a custom hardware RDMA architecture, and MPICH-VMI, an
implementation of the MPI library, has been ported to APENet.
