I just have a quick question as I've looked around but really haven't gotten a credible answer on the topic.

I have a server using TCP sockets and IOCP sending a custom binary protocol / flatbuffers. I just switched to using a scatter/gather approach for writing in order to avoid the memory copies into a large send buffer, as this way I can just burn direct from the packet queue. It worked out great, and I'm happy with the improvement as it's a noticeable gain with a large amount of clients / traffic.

What I'm wondering is if people are using scatter / gather on server reads? And if so what are the benefits to doing so? It was very easy to see the benefit for writes, but I'm not really sure what I would actually gain on read. I figured since I'm making changes at this level it might be wise to do so now if there is a benefit that I'm not seeing.

EDIT: Also I guess I should mention that incoming packets are variable length, otherwise that would be an easy to see win

Thanks for the input! Those were basically my findings, but I wasn't sure if I was missing something.

In a perfect world I'd have fixed sized packets using scatter / gather with RIO