Thanks Tim and Roger. I filed https://trac.torproject.org/projects/tor/ticket/24046.
(Not looking for any immediate fixes, just making sure those "Fast" 1 KB/s relays that you can see on blutmagie.de and the 100 KB/s threshold are not at odds with whatever minimal user experience Tor wants to provide). On Sun, Oct 29, 2017 at 5:47 PM, Roger Dingledine <a...@mit.edu> wrote: > On Sun, Oct 29, 2017 at 04:21:10PM -0700, Igor Mitrofanov wrote: >> It looks like 94.7% of all Running relays have the "Fast" flag now. If >> that percentage becomes 100%, the flag will become meaningless. >> What were the reasons behind the current definition of "Fast", and are >> those still valid? If not, should "Fast" become self-adjusting >> ("faster than 2 Mbps or 70% of all Guard relays, whichever is >> greater")? > > The goal of the Fast flag is to have some minimum threshold for whether > a relay is useful at all. > > It actually is self-adjusting, in that it gets assigned to the top 7/8ths > of the relays. But *also* it gets assigned to any relay that meets some > minimum bandwidth threshold: > https://gitweb.torproject.org/torspec.git/tree/dir-spec.txt#n2408 > > The "give it to them anyway if they're above the threshold" is a security > defense, else some jerk could sign up a whole lot of crummy relays, > driving other legitimate relays out of the network, thus making Sybil > attacks more effective. > > And the threshold is currently quite low -- 100KBytes/s. > > (It's actually more complicated than that, because some directory > authorities assign it based on their own measurements ("I must be voting > a consensus weight of at least 100 for this relay"), and others assign > it based on the relay's self-reported number ("The relay must be claiming > at least 100KBytes/s of capacity").) > > So think of Fast more as "worth using at all", where if you don't have > the flag, you don't have a chance of being chosen, and if you do, then > the consensus weights kick in to shift traffic towards bigger relays. > > --Roger > > _______________________________________________ > tor-relays mailing list > tor-relays@lists.torproject.org > https://lists.torproject.org/cgi-bin/mailman/listinfo/tor-relays _______________________________________________ tor-relays mailing list tor-relays@lists.torproject.org https://lists.torproject.org/cgi-bin/mailman/listinfo/tor-relays