[tor-relays] PerConnBWRate, RelayBandwidthRate, BandwidthRate

[teor]

> On 18 Feb 2018, at 11:17, nusenu <nusenu-lists at riseup.net> wrote:
> 
> Hello,
> 
> I've got two questions regarding some bw related torrc settings.
> 
> 1) 
> 
> after reading tor's manpage section about PerConnBWRate:
>> PerConnBWRate N
>> bytes|KBytes|MBytes|GBytes|TBytes|KBits|MBits|GBits|TBits If set, do
>> separate rate limiting for each connection from a non-relay. You
>> should never need to change this value, since a network-wide value is
>> published in the consensus and your relay will use that value.
>> (Default: 0)
> 
> I was wondering what value dir auths set in consensus, but I was not 
> able to find anything that looked like it in consensus [1].

That's because the directory authorities do not set a value in the
consensus.

> dir-spec [2]
>>        "perconnbwrate" and "perconnbwburst" -- if set, each relay sets
>>        up a separate token bucket for every client OR connectio [...]>         First-appeared: 0.2.2.7-alpha

This line is not accurate - the perconn* code still exists in Tor master:

>>        Removed-in: 0.2.2.16-alpha

https://gitweb.torproject.org/tor.git/tree/src/or/connection_or.c#n763

We should document the tor versions that implement consensus
parameters. There's no point documenting when the parameters were
present in the consensus. 

> Does that mean that dir auths stopped including it since tor 0.2.2.16-alpha
> should we update the manpage then?

Yes, we should update the man page so it doesn't say that the
value is in the consensus.

> Is there a default value if consensus does not say anything about it 
> or is there no per connection limit in that case?

The default is BandwidthRate/Burst. This should also be in the man
page.

Please feel free to open a ticket in Core Tor, 0.3.4.

> 2)
> Is there a RelayBandwidthRate torrc setting in addition to BandwidthRate
> so tor instances which act as clients and relays at the same time can
> have independent bw rates for each role (client, relay)?
> 
> BandwidthRate -> affects client and relay role
> RelayBandwidthRate -> affects only relay role
> is this correct?

Yes.

But it's slightly more complicated: when an OR connection is used
for client purposes (like downloading a consensus), all its cells are
counted as client bandwidth for the next 30 seconds.

T

> [1] https://collector.torproject.org/recent/relay-descriptors/consensuses/2018-02-17-23-00-00-consensus
> 
> [2] https://gitweb.torproject.org/torspec.git/tree/dir-spec.txt#n1847
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