[tor-bugs] #1916 [Metrics]: Visualize torperf tries that time out

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#1916: Visualize torperf tries that time out
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 Reporter:  arma     |       Owner:  karsten
     Type:  defect   |      Status:  new    
 Priority:  normal   |   Milestone:         
Component:  Metrics  |     Version:         
 Keywords:           |      Parent:         
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Comment(by karsten):

 I graphed timeouts and failures in the attached torperf-failure-
 timeout-2010-09-08.png . A failure is when a request finishes, but we
 receive fewer bytes than we asked for. A timeout happens when the timeout
 tool aborts a request in order to start the next one.

 There were quite a few timeouts (up to 10%) in May 2010 when the Tor
 network almost broke. But since then, the rate of failed or timed out
 requests is at roughly 1% for 50 KiB requests. The failure and timeout
 rates also decreased in the past few months as compared to last year. For
 1 MiB and 5 MiB, the percentages of failures are higher, because a single
 failed request means that 2.1% or 4.2% of all requests on that day failed.
 In the past few months, there were at most 1 or maybe 2 failures per day.

 Adding more graphs or changing existing graphs on the metrics website is
 difficult right now, because Kevin and I are merging his GSoC stuff. But I
 attached the R sources to plot this graph. We can easily make a new graph
 in a matter of minutes if we think the failure or timeout rate might have
 changed.

 Is there anything in particular that I should look closer at?

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/1916#comment:1>
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