sftp performance problem, cured by TCP_NODELAY

[Rick Jones]

Miklos Szeredi wrote:
>>What sort of socket calling pattern was sftp making that had it
>>running into issues with Nagle and delayed ACK?
> 
> 
> Don't know exactly why Nagle kicks in,

In broad handwaving terms, applications that try to do "write write read" can 
run afoul of interactions between Nagle and delayed ACK.

> but it does so quite early, after just a couple of READ request/reply pairs.
> I can send you tcpdump output tomorrow.

Thanks.  I would like to see it.

rick