Bug#1117631: openssh: Connection sharing is very sluggish.

Sebastian Andrzej Siewior <[email protected]> writes:

> Since the 10.1p1 connection sharing (ssh -M, ControlMaster yes) is very
> sluggish. It turns to be a openssh regression that is already fixed as
> of commit beae06f56e0d0 ("upstream: don't reuse c->isatty for signalling
> that the remote channel") in the portable tree. Please find attached the
> patch.

> Since I have it almost always enabled, especially for long distance
> connection, I can't use it. Hence the severity.

Confirmed here as well. 10.1p1 with ControlMaster is essentially unusable
for interactive ssh, with very long pauses between every keystroke. I had
to downgrade to 10.0p1-8 to get a usable connection.