Michael Stone wrote: > Data Questions: > > * Are the measurements used to make the display of 'distributions of > profile arrival rate vs. time' produced from timestamps of profile > arrival as recorded by all the laptops or by some smaller set of > 'sentinels'? >
All XOs got synced clocks (by means of a broadcast packet that sets the time on all machines, providing a clock skew in the neighborhood of a single second). Then, timestamps of profile arrivals were collected from all 65 nodes, each reporting arrivals for the other 64 nodes. > * What was the general nature of the connectivity graph of the 65 > laptops? Did it change over time? > The nodes are lying in the Garden area of 1CC, and they were consistently 1-hop away from all other nodes (full mesh network) all the time. > * Did you take any measurements of background network traffic? > No, but I should have. However, we can all agree that 1CC is relatively noisy environment. > * Do you have any new insight into how the presence of NM (or of > software on top of it that depended on it) was killing your > interfaces? > My understanding is that the NM is trying its best to make ends meet in terms of what the user needs (connect to an AP/XS/mesh ?) and what connection is most "reliable" (I assume that an AP is considered more "reliable" than the mesh, but I honestly doubt it!). As a result, the NM may occasionally make the bold move to move from one connection type to another, breaking all existing "connections" (quoted because there are no TCP-like connections in my experiments), leaving stale information at various points of the software stack (eg. mesh view). > At any rate, thanks for this good work! > > Michael > > P.S. - When you produce measurements like these, please include links to > the raw data. > The raw capture is here: http://lyme.media.mit.edu/cerebro/capture-1 Pol -- Polychronis Ypodimatopoulos Graduate student Viral Communications MIT Media Lab Tel: +1 (617) 459-6058 http://www.mit.edu/~ypod/ _______________________________________________ Devel mailing list Devel@lists.laptop.org http://lists.laptop.org/listinfo/devel