[tor-bugs] #17598 [Tor]: Trace cell queue times in Tor to measure Tor application "congestion"

Tor Bug Tracker & Wiki blackhole at torproject.org
Thu Jan 14 15:11:55 UTC 2016


#17598: Trace cell queue times in Tor to measure Tor application "congestion"
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 Reporter:  robgjansen   |          Owner:
     Type:  enhancement  |         Status:  new
 Priority:  Medium       |      Milestone:  Tor: 0.2.8.x-final
Component:  Tor          |        Version:
 Severity:  Normal       |     Resolution:
 Keywords:               |  Actual Points:
Parent ID:  #12541       |         Points:
  Sponsor:               |
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Comment (by dgoulet):

 So I want to fully understand here. The goal is:

 1) Record when a cell is created with the amount of bytes

 --> Keep in state the cell ID and size for a specific connection X.

 2) Record the amount of bytes once it's packed (??)

 --> Update the state with the packed size for the cell ID and connection
 X.
 --> Record the position of the packed cell in the output buf just after we
 wrote in it.

 3) Record when that specific cell is written to the kernel

 --> For connection X, record when the cell ID has been written to the
 kernel.

 Is that correct?

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/17598#comment:3>
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