[tor-relays] Making use of new bandwidth

teor teor at riseup.net
Sun Apr 7 22:01:42 UTC 2019

One more thing:

> On 8 Apr 2019, at 07:57, teor <teor at riseup.net> wrote:
> Hi,
>> On 7 Apr 2019, at 05:19, Logforme <m7527 at abc.se> wrote:
>> I run the non-exit relay: https://metrics.torproject.org/rs.html#details/855BC2DABE24C861CD887DB9B2E950424B49FC34
>> The relay run on a debian stretch machine with an i5-4670 at 3.8GHz with 4GB memory. CPU usage at 250Mbps traffic is around 40% of 1 core out of 4.
>> On April 1st my ISP doubled my bandwidth, from 250Mbps to 500Mbps.
>> So far the Tor bandwidth authorities seems to not have picked up on all the new bandwidth. The observed bandwidth number has changed twice, increasing with small amounts.
>> How long does it take for the BW authorities to eventually observe a BW closer to 500Mbps. Weeks? Months?
> Your relay observes its own bandwidth, and tells the bandwidth authorities the
> maximum over the last 5 days.
> Looking at the 6 months graph from 1 April, your relay's observed bandwidth has
> increased about 5-10%. A small increase per week isn't bad for a guard: even if
> your consensus weight goes up, it takes time for clients to rotate guards.
> The bandwidth authorities also measure the excess bandwidth on your relay every few
> days, and combine their measurements with your relay's observed bandwidth to
> generate their consensus weight votes. The consensus value is the low-median of
> those votes.
> Looking at the consensus weight graph, the votes haven't changed much at all.
> (The consensus weight changes the number of clients that use your relay, which
> increases its observed bandwidth, but decreases the measured bandwidth. Eventually
> these changes balance out.)
>> The reason I ask is that I wonder if I should run a second Tor instance or if the current one will be able to make use a a reasonable part of the 500Mps.
> It looks like your relay could be CPU-core-limited, or limited by some other
> local resource, or limited by its location.

It's probably a local resource, because the bandwidth authority measurements don't
vary much, even though the bandwidth authorities are on two different continents:

> To work out where the limit is, run another Tor instance.
> You could also wait another week to see if your relay picks up another 5-10%
> traffic increase.
> T

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