On 22 June 2017 at 08:29, Andres Freund <and...@anarazel.de> wrote:

> I.e. we're doing tiny write send() syscalls (they should be coalesced)

That's likely worth doing, but can probably wait for a separate patch.
The kernel will usually do some packet aggregation unless we use
TCP_NODELAY (which we don't and shouldn't), and the syscall overhead
is IMO not worth worrying about just yet.

> and then completely unnecessarily call recv() over and over again
> without polling.  To me it looks very much like we're just doing either
> exactly once per command...

Yeah, that looks suspect.

 Craig Ringer                   http://www.2ndQuadrant.com/
 PostgreSQL Development, 24x7 Support, Training & Services

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