Re: Why SFTP performance sucks, and how to fix it

[Markus Friedl <markus%openbsd.org@localhost>]

On Tue, Jul 08, 2003 at 09:12:16AM +0200, Markus Friedl wrote:
> On Tue, Jul 08, 2003 at 04:01:02PM +1200, Peter Gutmann wrote:
> > TCP/IP provides a
> > reliable, flow-controlled transport layer for the SSH protocol.
> 
> when multiplexing multiple ssh channels over one connection and one
> of the consumers is very slow, then the tcp flow control will not
> help. AFAIK, this is one of the reasons why there's an additional
> per-channel flowcontrol.

I'd like to add that ssh/sshd act as a 'distributed' TCP-proxy,
so they break end-to-end TCP flow control for forwarded TCP
connections.

>From this point of view, the channel flow control mechanism makes
very much sense.