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[tor-bugs] #34023 [Metrics/Onionperf]: Kill the 50 KiB downloads
#34023: Kill the 50 KiB downloads
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Reporter: karsten | Owner: metrics-team
Type: enhancement | Status: new
Priority: Medium | Milestone:
Component: Metrics/Onionperf | Version:
Severity: Normal | Keywords:
Actual Points: | Parent ID:
Points: | Reviewer:
Sponsor: |
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On #33076 we discussed whether we should kill the 50 KiB downloads in
deployed OnionPerfs and only keep the 1 MiB and 5 MiB downloads. The
primary reason would be that our [https://metrics.torproject.org
/onionperf-throughput.html throughput] graphs would be based on five times
as many data points per day, because they only include 1 MiB and 5 MiB
downloads, but not 50 KiB downloads. This would not affect our
[https://metrics.torproject.org/onionperf-latencies.html circuit round-
trip latencies graphs] which include all three downloaded file sizes.
The main reason against killing 50 KiB downloads is that OnionPerfs would
consume more bandwidth and also put more load on the Tor network. Let's
consider two scenarios with and without 50 KiB downloads. In both
scenarios we're making a new download every 5 minutes, randomly chosen
with a weight of 1.0 for 5 MiB runs, 2.0 for 1 MiB runs, and either 12.0
or 0.0 for 50 KiB runs:
- With 50 KiB downloads we're downloading on average `12/15 * 50 KiB +
2/15 * 1 MiB + 1/15 * 5 MiB = 517 KiB` every 5 minutes, or `517 * 8 * 1024
/ (300 * 1000) = 14 kbps`.
- Without 50 KiB downloads we're downloading on average `2/3 * 1 MiB +
1/3 * 5 MiB = 2389 KiB` every 5 minutes, or `2389 * 8 * 1024 / (300 *
1000) = 65 kbps`.
These numbers are both tiny in comparison to the overall network capacity
and to other services like the bandwidth scanners.
I'm going to make this change and deploy it on new OnionPerf instances
tomorrow, unless I hear objections here.
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/34023>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
The Tor Project: anonymity online
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