[Tmrg] Traffic generators

[Jay Aikat]

Sangtae,
	I use tmix on FreeBSD and wanted to clarify your question below about "how many 
machines are required to generate the traffic based on the trace".

It really depends on the capability of the machines.  I have used medium grade 
machines, ~1GHz CPU 1GB RAM as well as 500MHz CPU with 256 MB RAM, within a lab 
network (I have not used tmix in ns2).  The idea with tmix is that, given the 
original trace, you create a set of connection vectors for each pair of machines 
in the network, knowing the target throughput you wish to generate, and the 
capability and number of machines in your network.

I hope this answers that question, if not I can clarify further.  I was not 
involved in this discussion so, I am not sure what is known and not known to 
this group about tmix.  But I use it on FreeBSD and would be happy to clarify 
points.  Thanks,
--Jay.


SANGTAE HA wrote:
> Lachlan,
> 
> Joel clarified the scope of Harpoon. Thank you for clarifying this, Joel.
> Then, somehow we need to consider the other candidate, Tmix, which we
> discussed at the meeting.
> 
> Tmix[1] paper says that it supports source-level and session-level
> replaying of the trace, so it is expected to support both short-lived
> (HTTP and VoIP) and long-lived (FTP and P2P) flows. The connection
> vectors which Tmix builds from the trace can be used in NS2 and over
> testbed, so we can use the same traffic for both environments.
> 
> But, I recall that the implementation of Tmix for Linux was not ready
> a year ago (only available for FreeBSD platform at that time).
> Also it is not clear how many machines are required to generate the
> traffic based on the trace, which is also important for us.
> 
> If we get these answers from the authors, we are right before the
> selection of the traffic generator for TCP testing.
> I am CCing to Michele, one of the author of this paper, for the latest
> status of Tmix.
> 
> Thanks,
> Sangtae
> 
> [1] Tmix: A Tool for Generating Realistic TCP Application Workloads in
> ns-2, http://www.sigcomm.org/ccr/drupal/?q=node/50
> 
> 
>> On Nov 21, 2007 8:49 PM,  <jsommers at cs.wisc.edu> wrote:
>> Yes, file arrival times and file sizes are specified when generating
>> traffic with Harpoon.  Indeed, sessions are intended to mimic longer-time
>> scale variations in traffic volume.  They are *not* intended to model
>> anything about the web, or web sessions.
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