#34215: Harmonize TTFB/TTLB definitions with Tor Metrics plots
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Reporter: karsten | Owner: karsten
Type: defect | Status: needs_review
Priority: Medium | Milestone:
Component: Metrics/Onionperf | Version:
Severity: Normal | Resolution:
Keywords: | Actual Points:
Parent ID: #33327 | Points:
Reviewer: | Sponsor: Sponsor59
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Changes (by karsten):
* status: accepted => needs_review
Comment:
The first question here is how we want to define TTFB/TTLB:
- Right now, OnionPerf considers the time between the `tgen` client
sending the HTTP request to the `tgen` server and receiving the first/last
byte of the HTTP response back as TTFB/TTLB. This excludes all the magic
happening inside the `tor` client to provide a circuit and attach a stream
to it. In some cases this is pretty fast, for example, when it can reuse a
pre-built circuit to connect via an exit to its own `tgen` server. In
other cases this can take a while, for example, when it needs to do the
entire ~~hidden~~onion service connection establishment dance.
- The [https://metrics.torproject.org/torperf.html Time to download files
over Tor graph] on the Tor Metrics website measures TTLB as the time
between the `tgen` client starting a measurement and receiving the last
byte of the HTTP response from the `tgen` server. This includes all the
magic as written above.
I'd argue that we do care about measuring what's going on in `tor`, so we
should switch OnionPerf to the definitions used on the Tor Metrics website
graph.
[https://gitweb.torproject.org/user/karsten/onionperf.git/commit/?h=task-34215&id=a836f8747398d010646858743d62867ac1a35504
Commit a836f87 in my task-34215 branch] contains the trivial patch.
Comments welcome! I'll also bring this up for discussion at our next
weekly meeting.
--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/34215#comment:3>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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