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List:       user-mode-linux-user
Subject:    [uml-user] virtual network latency and performance with uml_switch
From:       Fermin Galan Marquez <galan () dit ! upm ! es>
Date:       2002-11-25 15:18:10
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Hello everyone.

I'm running about twenty UMLs in the
same physical box interconnected using
uml_swicth. UMLs use IPv6 addresses.

I execute commands in UMLs through remote
console from the physical host enviroment. 
I mean, something like this

	# ssh -1 -n <UML_IPv6_ADDRESS> <COMMAND>

(For problems with RSA1 keys, I use version
1 of SSH protocol).

The problem it's that I have a *great* delay
(tens of seconds) since I invoke ssh until I 
get output of the execution of the command.

Is it usual to get such latency? I wonder if the
problem it's related with the performance of
uml_switch (the daemon it wouldn't be capable of
process packets quickly). Has anybody figures
of filtering performance of this tool?

Futhermore, I get the following message very
often in the output of uml_switch:

	send_sock: Resource temporarily unavailable

What's its exact meaning?

Any help in order to improve this delay problem
it's welcome. Thanks in advance!

-------
Fermín
DIT UPM



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