2) Performance. In addition to memory usage problem,
connection oriented protocols such as TCP, with their
inherent flow-control and congestion management limit
performance [11]. HPC applications running on a local
cluster do not require the complexities of TCP flow and
congestion management. UDP offers a much lighter weight
protocol that can significantly reduce the latency of
individual messages, closing the latency gap between
iWARP and other high speed interconnects. In addition,
many datacenter applications such as those using media
streaming protocols over WAN are currently running on top
of unreliable datagram transports such as UDP. Due to such
semantic discrepancies, the current connection-oriented
specification of iWARP makes it impossible for such
applications to take advantage of iWARP’s major benefits
such as zero copy and kernel bypass.
3) Fabrication cost. The complexities associat