Re: [tor-dev] Proposal: Tor bandwidth measurements document format

Subject: Re: [tor-dev] Proposal: Tor bandwidth measurements document format

Date: Sat, 5 May 2018 11:18:47 +1000

Delivery-date: Fri, 04 May 2018 21:19:06 -0400

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On 2 May 2018, at 22:39, teor <teor2345@xxxxxxxxx> wrote:

>     Tor accepts zero bandwidths, but they trigger bugs in older Tor
>     implementations. Therefore, implementations SHOULD NOT produce zero
>     bandwidths. Instead, they SHOULD use one as their minimum bandwidth.

And if there are zero bandwidths, the parser MAY ignore them.

Bandwidth files also need to respect MaxAdvertisedBandwidth and

RelayBandwidthRate/Burst. We need to specify that the relay descriptor

bandwidth rate and burst should limit the bandwidths in the file.

Torflow supports MaxAdvertisedBandwidth by putting relays in partitions

that match their bandwidth. Maybe it also does some other adjustments.

sbws can probably just do a min() using the measured bandwidth:

https://github.com/pastly/simple-bw-scanner/issues/155

For details, see:

https://trac.torproject.org/projects/tor/ticket/8494#comment:5

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