Hi John,
On Di 21 Feb 2012 17:09:57 CET "John A. Sullivan III" wrote:
On Tuesday 2012-02-21 09:43, John A. Sullivan III wrote:
On Tue, 2012-02-21 at 09:30 +0100, Jan Engelhardt wrote:
On Tuesday 2012-02-21 07:05, John A. Sullivan III wrote:
I've been working on a project to implement traffic shaping to conform to 95th percentile billing including our X2Go virtual desktops. One of the challenges is prioritizing the interactive X2Go traffic (screen, keyboard, mouse) differently from bulk traffic like local share transfers, printing, and possibly sound. I thought this would be trivial because of the SSH transport since SSH sets the minimize-delay bit for interactive traffic and the maximize-throughput bit for bulk transfers.
If a user has his own machine, he can of course do whatever he wants. Second, if he can pass options to ssh, he can set the QOS type arbitrarily, and even where that is not available for control, one can still cause the openssh client to use interactive TOS marking for bulk transfers, since secondary ssh channels (e.g. tunnels) do not pass up the TOS mark. <snip> However, Windows and Mac clients may not be using OpenSSH.
That too. All these reasons is why TOS is not a reliable characteristic to determine the question of bulk-or-interactive.
PS - out of curiosity, now does one set the QoS type in OpenSSH?
ssh -o IPQoS={bulk|interactive|0x12345} ...
ssh -L 2000:localhost:22 foohost & rsync -HPave 'ssh -p 2000' bulky.iso localhost:
and in fact, wouldn't the output
ls -Rl /in an interactive shell also best be count as bulk... <snip> Interesting. Looks like that was introduced in 5.6. Squeeze is running 5.5 but it should default to 0x10/0x08 if not set. I'm not seeing any TOS bits set which is why I suspect it is the libssh call as I assumeOn Tue, 2012-02-21 at 10:11 +0100, Jan Engelhardt wrote: that does not reference the openssh configuration.
If someone can point out where the socket options are set, I can take a look and see if I can figure out how to fix it but I don't know a thing about socket programming. I assume one has to make some kind of a call to IP_TOS or perhaps it is part of setsockopts and SO_PRIORITY. Thanks
- John
The sockets are probably created and configured in here... http://code.x2go.org/gitweb?p=x2goclient.git;a=blob;f=sshprocess.cpp
Mike
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