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What we know
- STP is a protocol that improves network latency by preallocating buffer space on the receiving end. With zero-copy buffers, the CPU load even in high-bandwidth transfers is minimal.
- STP supports implementation in hardware at the NIC level to improve performance. SGI claims that without this, performance is little better than plain TCP/IP.
- STP uses regular AF_INET sockets, using the IP_PROTOSTP flag.
- Example code
What we need to know
- Test SGI's claim as to whether the software implementation of STP isn't better than TCP.
- Figure out whether any of our NICs can support STP in hardware. Alteon Tigon NICs already have a driver in the patch.
- Test out simple data transfer with STP sockets.
- Port 2.4 patch forward to 2.6.
- Add support for STP to LAM-MPI.