Changes between Version 3 and Version 4 of GeniTmix

Timestamp:

10/12/12 13:49:39 (12 years ago)

Author:

Ben Newton

Comment:

--

GeniTmix

@@ -1 @@
-= Tmix on Geni =
-Placeholder for Tmix on Geni page
+= Tmix on ProtoGeni =
+Information about Running experiments using the Tmix traffic generation system on ProtoGENI nodes.
+== What is Tmix? ==
+In order to perform realistic network simulations, one needs a traffic generator that is capable of generating realistic synthetic traffic in a closed-loop fashion that "looks like" traffic found on an actual network.
+
+The Tmix system takes as input a packet header trace file captured from a network link of interest (such as the link between the UNC campus and the rest of the internet). This trace is reverse-compiled into a connection vector (or cvec) file, which is a source-level characterization of each TCP connection present in the trace. Tmix then uses this information to emulate the socket-level behavior of the source application that created the corresponding connection in the trace. The resulting traffic generation is statistically representative of the traffic measured on the real link.
+
+== Traffic Generation ==
+One of the most complex components of empirical evaluations is modeling and generating 
+realistic Internet traffic. The mix of the ever changing and varied applications that constitute the 
+actual Internet traffic makes this a daunting task. Moreover, Internet traffic is different when 
+sampled at different times and in different parts of the globe. Networking researchers have 
+grappled with this problem by taking snapshots of Internet traffic at different times and at various 
+points in the network, and modeling the same for generating traffic in the lab. The generally held 3
+belief is that the more realistic the traffic used, the more reliable are the results of the empirical 
+evaluations using that traffic. Practice, however, does not adhere to this principle. So, although 
+laboratory testbeds and methods for simulations have evolved over the years, the question about 
+what constitutes essential components for modeling realistic traffic remains open for debate. For 
+example, networking researchers agree that realistic traffic generation for empirical research is 
+best accomplished by capturing traffic on a production link and then using source-level models to 
+generate this traffic in the laboratory or simulator. Source-level models capture the application 
+exchanges and application behavior on the ends (sources) of the TCP connections. But how do 
+you go from the original captured traffic to an acceptable source-level model? Which of the 
+several measures derived from the traffic sources should you model in your workload for your 
+experiments? Would your modeling choices for traffic generation impact the outcome of your 
+experiments? If yes, how significant would the impact be? These remain open questions.  
+
+== Tmix Experiments on ProtoGeni ==
+1. Experiment 1
+2. Experiment 2
+3. Experiment 3