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Mailing List Archive: OpenSSH: Bugs

[Bug 1983] add an option for disabling buffering

 

 

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bugzilla-daemon at bugzilla

Mar 8, 2012, 3:11 PM

Post #1 of 3 (239 views)
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[Bug 1983] add an option for disabling buffering

https://bugzilla.mindrot.org/show_bug.cgi?id=1983

Damien Miller <djm [at] mindrot> changed:

What |Removed |Added
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CC| |djm [at] mindrot

--- Comment #1 from Damien Miller <djm [at] mindrot> 2012-03-09 10:11:15 EST ---
ssh generally tries to get data moved from its buffers at the earliest
possible time. What problem are you experiencing and can you provide a
recipe to reproduce it?

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bugzilla-daemon at bugzilla

Mar 8, 2012, 3:15 PM

Post #2 of 3 (235 views)
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[Bug 1983] add an option for disabling buffering [In reply to]

https://bugzilla.mindrot.org/show_bug.cgi?id=1983

Darren Tucker <dtucker [at] zip> changed:

What |Removed |Added
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CC| |dtucker [at] zip

--- Comment #2 from Darren Tucker <dtucker [at] zip> 2012-03-09 10:15:34 EST ---
Are you sure it's not the remote command that's causing the buffering?
sshd will send output to the network as soon as it's available,
although it may get buffered in the TCP stack.

this:
$ ssh localhost "tty; while sleep 1; do date; done"

gives me "not a tty" and output at approximately 1 second intervals.

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bugzilla-daemon at bugzilla

Mar 9, 2012, 8:13 AM

Post #3 of 3 (224 views)
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[Bug 1983] add an option for disabling buffering [In reply to]

https://bugzilla.mindrot.org/show_bug.cgi?id=1983

--- Comment #3 from Andrew McNabb <amcnabb [at] mcnabbs> 2012-03-10 03:13:20 EST ---
I'm sorry; you're completely right. I should have looked into this a
bit more. I opened this because of a user report, and I should have
been more careful. It turns out that the user was running a Python
script, and Python buffers stdout aggressively by default. There are
easy workarounds, none of which involve changing the behavior of ssh.
:) Sorry for the noise.

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