Performance: Provide means to disable read buffer

[euroelessar]

Please answer these questions before submitting your issue.

What version of gRPC are you using?

grpc-go 1.11

What version of Go are you using (go version)?

go version go1.8.4 linux/amd64

What operating system (Linux, Windows, …) and version?

Linux

What did you do?

I've read golang's TLS and gRPC's http2 server code.

What did you expect to see?

gRPC provides means to disable read buffer for better performance while decreasing memory usage.

What did you see instead?

It looks like both TLS and gRPC have their own read buffers (by default ~8-16KB and 32KB accordingly) and gRPC buffer just performs memory copies from TLS buffer on every Read call without affecting number of syscalls while paying extra memory and cpu costs (for having buffer and performing extra memory copies accordingly).

Is it possible to provide grpc.DisableReadBuffer or similar option, please?