[tor-dev] Dir auths using 2x bandwidth in last week

teor teor2345 at gmail.com
Mon Aug 21 03:56:16 UTC 2017

> On 10 Aug 2017, at 13:36, Roger Dingledine <arma at mit.edu> wrote:
> https://atlas.torproject.org/#details/9695DFC35FFEB861329B9F1AB04C46397020CE31
> https://atlas.torproject.org/#details/F2044413DAC2E02E3D6BCF4735A19BCA1DE97281
> https://atlas.torproject.org/#details/BD6A829255CB08E66FBE7D3748363586E46B3810
> https://atlas.torproject.org/#details/74A910646BCEEFBCD2E874FC1DC997430F968145
> https://atlas.torproject.org/#details/7EA6EAD6FD83083C538F44038BBFA077587DD755
> all show a big increase in sent bytes starting at the end of July.
> It isn't growth in Tor users, since those have stayed relatively flat
> in the last two weeks.
> And the new rate seems to be the new normal -- it's showing no signs of
> going back to the old rate.
> I would assume it's outgoing directory stuff, since that's most of what
> dir auths do.
> Any guesses?

In July, Tor 0.3.0 became the most common relay version in the network,
growing at quite a rapid rate:


There doesn't seem to be any corresponding Tor Browser release in that

3 July: https://blog.torproject.org/blog/tor-browser-702-released
8 August: https://blog.torproject.org/blog/tor-browser-704-released

(Our estimates suggest that half the load on directory authorities is
from relays, and half is from clients.)

I wonder if the new guard selection algorithm, or some other relay
change, is causing relays to download more descriptors from more
directory authorities?

Tim Wilson-Brown (teor)

teor2345 at gmail dot com
PGP C855 6CED 5D90 A0C5 29F6 4D43 450C BA7F 968F 094B

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