ssh channel window and adjustment

[Avraham Fraenkel - Commatch]

1) I think you should mail to: openssh-unix-dev at mindrot.org
2) I think that you have some miss-understood: 
    the client and server count the window independtly.
    It mean:
     concerning data sent from client to the server:
      the SERVER set it initial window size and whenever he ready to get
more data he sent adjust.
      such data can be a user command which generate a lot of output in the
other directotion.
     concerning data sent from server to the client
      the CLIENT set his initial window size and after he have place to
process more data he send adjust to the server,
      so the server can proceed to send the output to the client.
      The openssh sends adjust to the server if the client succeed to
process half the max window size. it is not depend about how much data he
sent to the server. it depend how much data he send to the stdout of the
client!!!
--
 Avraham (mailto:avhf at alum.cs.huji.ac.il)
    
    

-----Original Message-----
From: Sombody Somewhere [mailto:koda_e at yahoo.com]
Sent: Wednesday, January 22, 2003 2:20 PM
To: ietf-ssh at netbsd.org
Subject: Re: ssh channel window and adjustment 


Hi all!


 Thank you for your replies. Basicly your opinions
confirmed my theory about the implementations and
standards ;).
Recently I investigated the OpenSSH client behaviour.
It seems to me that OpenSSH client sends
SSH_MSG_CHANNEL_WINDOW_ADJUST, when it writes more
than the half of its own channel window size(the
initial channel window size it is sending to its
peer,when opening new channel). I think that this
behaviuor may be quite incorrect. Here is an example
of such situation: let's say the user using OpenSSH
client sends commands to th SSH server and if we
suppose these  commands have big console output, then
OpenSSH client's channel window may be filled much
faster than the server's channel window space,but the
server is obliged no to write its output untill the
client sends it adjust message. This way the server is
 obliged to allocate great amount of data and keep it
allocated untill the the amount of data written by the
client exceeds the half of its own channel. Just then
the server will recieve adjust. In my opinion the
adjust message sneding has to be dependent on amount
of data read not written.
I would appreciate any comments on my opinion and
thank you again for your attention :)


P.S. I am afraid that this posting maybe treated as
out of topic but I think that people developing the
OpenSSH are reading this mail list and also I think
that if my opinion is generally wrong(having in mind
the drafts) this is the place to be corrected ;)

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