| Comments on Section 3.1 |
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This graph plots all the checks done by the scanners for the duration of the event.
It combines the data from all 4 of the streams (28k, 56k, 100k, 300k).
Each blue square represents one check and its vertical position is determined
by its frustration time. (The longest frustration time you can have is 60 seconds
because that is the duration of the check.)
Superimposed on the chart are some markers for important times in the event. Unfortunately, we don't have an authoritative source for these times so we had to cull info from the press. You can see that at 17:30 (23:30 in London), there was a dramatic drop in the frustration time. This is because the show ended and most of the viewers dropped off leading to a much lower load on the serving network. Hence, lower connect times and, to a lesser extent, lower buffer times. At 18:00, it looks like the webcast ended. You can see, however, that some connections continue up to 18:15. Explanation: the distributed nature of the server network means that it takes time for the "switch off" information to propagate. For the purposes of this report, no data was considered past 18:00. |