I've worked quite extensively with openonload. There were significant numbers of "free wins" just from LD_PRELOAD though anything non trivial did require more c

I've worked quite extensively with openonload. There were significant numbers of "free wins" just from LD_PRELOAD though anything non trivial did require more configuration (mostly via env vars!). I've also written ef_vi applications for udp/mc pub in a similar market space to the one you describe. Whilst a little quirky in places you could write some incredibly fast stuff. on 2.xGHz xeon cpus you could send a useful datagram in 600-700ns. For a lot of applications you could even leave that in your critical path and not care.