Hi John, On Di 21 Feb 2012 17:09:57 CET "John A. Sullivan III" wrote:
On Tue, 2012-02-21 at 10:11 +0100, Jan Engelhardt 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 assume 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 -- DAS-NETZWERKTEAM mike gabriel, dorfstr. 27, 24245 barmissen fon: +49 (4302) 281418, fax: +49 (4302) 281419 GnuPG Key ID 0xB588399B mail: [email protected], http://das-netzwerkteam.de freeBusy: https://mail.das-netzwerkteam.de/freebusy/m.gabriel%40das-netzwerkteam.de.xfb
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