Changes between Version 9 and Version 10 of doc/BandwidthAuthorityMeasurements


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Timestamp:
Dec 3, 2017, 10:15:10 PM (3 years ago)
Author:
teor
Comment:

Notes about using CDNs for bandwidth servers

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  • doc/BandwidthAuthorityMeasurements

    v9 v10  
    8383Adding or moving bandwidth authorities changes relay measurements: relays closer to the new location will be measured higher. A bandwidth scanner affects Guard and Middle measurements. A bandwidth server affects Exit measurements.
    8484
    85 ==== A Worked Example ====
     85==== A Quick Example: CDN ====
     86
     87Using a CDN as a bandwidth server spreads the load from exits around the world. It avoids concentrating exit bandwidth near existing bandwidth servers in the US and Western Europe. This should also move entry and middle bandwidth further away from the scanners in these areas.
     88
     89However, it can result in very fast measurements if the scanner, both relays, and server are all in the same CDN data center.
     90
     91Here's how we can avoid this issue:
     92* make sure that the scanner isn't in one of the CDN data centers,
     93* use different CDNs for different scanners,
     94* configure the bandwidth scanner with a CDN, and with other bandwidth servers that aren't in one of the CDN data centers.
     95
     96==== A Detailed Example: South America ====
    8697
    8798(TODO: too much detail?)