Here's an update on this change:
> On 26 Oct 2017, at 08:46, teor <teor2345@xxxxxxxxx> wrote:
>
>> On 26 Oct 2017, at 06:36, nusenu <nusenu-lists@xxxxxxxxxx> wrote:
>>
>> teor:
>>> We would like to make Tor relays report their bandwidth statistics
>>> every 24 hours, rather than every 4 hours.
>>
>> How has the new time period been decided on?
>> Is one day the upper bound for some use-case?
>> If longer periods (2, 3 or 7 days...) are safer: why not increase it
>> even more?
>
> We decided to make the bandwidth statistics interval 24 hours
We will change the bandwidth statistics interval to 24 hours, and
remember and report 5 periods in each extra-info.
(It used to be 4 hours and report 6 periods in each extra-info.)
> because relays already report observed bandwidth every 24 hours
> in their descriptors. (More precisely, they re-post their descriptors
> approximately every 24 hours
We will leave the regular bandwidth reporting in descriptors as it
is.
> or when the bandwidth changes by
> more than 2x
Bandwidth changes could trigger a descriptor re-post every 20 minutes,
we will change this to 3 hours.
We chose 3 hours because it takes about that much time for updated
relay bandwidths to get to most clients:
* 10 minutes to 70 minutes for descriptor upload to be included in a
consensus
* 0 minutes to 30 minutes for a mirror to have the new consensus
* 0 minutes[1] to 110 minutes for a client to fetch the new consensus
[1] when bootstrapping, clients sometimes fetch directly from
authorities. Otherwise, this would be 45 minutes.
https://gitweb.torproject.org/torspec.git/tree/dir-spec.txt#n3412
> To increase both these intervals beyond 24 hours, we would have
> to make major changes to the bandwidth authority subsystem as
> well.
>
> So this is the simplest change that yields a significant improvement
> in client anonymity.
We have deferred any major changes to at least 0.3.3, and opened a new
ticket:
https://trac.torproject.org/projects/tor/ticket/24104
--
Tim / teor
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