> > I'm sure rsocket has its place with much smaller transfer sizes, but > > this is very different. > > Is it possible to make rsocket be friendly with large buffers (>4GB) like the > VM > use case?
If you can perform large VM migrations using streaming sockets, rsockets is likely usable, but it will involve data copies. The problem is the socket API semantics. There are rsocket API extensions (riowrite, riomap) to support RDMA write operations. This avoids the data copy at the target, but not the sender. (riowrite follows the socket send semantics on buffer ownership.) It may be possible to enhance rsockets with MSG_ZEROCOPY or io_uring extensions to enable zero-copy for large transfers, but that's not something I've looked at. True zero copy may require combining MSG_ZEROCOPY with riowrite, but then that moves further away from using traditional socket calls. - Sean
