Date: Fri, 29 Sep 2000 17:23:30 -0700 (PDT) From: Matt Dillon <dillon@earth.backplane.com> To: freebsd-security@FreeBSD.ORG Subject: Proposed minor mod to openssh for interactive operation Message-ID: <200009300023.e8U0NUW20137@earth.backplane.com>
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At the moment openssh only turns on TCP_NODELAY etc if it thinks
you are creating an interactive shell, based on whether it allocates
a pty or not.
Unfortunately, I have an application (and I expect this would be useful
generally) which uses a ssh link between two programs interactively.
That is, send command, wait response, send command, wait response.
Delaying packets is a bad idea and cuts performance over the link
by about 20%.
I would like to propose predicating the TCP_NODELAY option on whether
the ssh link is two-way or not. Since most batch commands use ssh -n
(no stdin), and most interactive commands use ssh without -n (with
stdin), I think having ssh set TCP_NODELAY based on -n is the
correct solution. Specifically, if -n is not passed, NODELAY is
turned on.
I have trivial patches (two minor tests), any objections to my committing
them? Also, I'm not sure whether we are trying to keep our openssh
synced with openbsd's. Does anyone know the procedure for making
changes to openssh in FreeBSD's CVS tree?
-Matt
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