NFD

Some time ago I proposed to use boost::circular_buffer in StreamFace instead of the current linear array, in order to avoid copying the data. Asio already supports scatter/gather operations, so this change would be almost transparent for the face itself. As far as I know, the only problem is that ndn-cxx doesn't support reconstructing a Block from a non-linear buffer.

This is Unsupported because ndn-cxx doesn't support packet size over 8800 octets.

MTU is there for a reason. Don't abuse it by setting a large packet size limit.

If you just want to make it consistent, add a delay for packets that take shorter time.

That would be a correct, although not ideal, solution.

A fundamental issue with StreamFace zero-copy by circular buffer (or, more generally, storing multiple incoming packets in the same buffer) is: packet lifetime differs by each packet.

Suppose there are three consecutive incoming Data packets, the first and third are cached by ContentStore, but the second is dropped because it's unsolicited.

The buffer space for the second Data packet is now available, but it can't be reused or deallocated until the first and third Data packets are evicted from ContentStore.