[atlas] probe selection criteria on "WW" measurements
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Andreas Strikos
astrikos at ripe.net
Thu Jul 24 16:24:02 CEST 2014
Hi Paul, On 7/24/14, 3:26 PM, Paul Vlaar wrote: > Hi, I have two questions regarding probe selection for UDMs. > > When I specify for example that I want to run an ongoing measurement on > 250 probes in the "WW" region, will these probes remain the same > throughout the lifecycle of the measurement (unlimited) or will these be > somehow randomized every time the measurement is run? > > Secondly, I am wondering about even spread of probe location in doing > such a measurement. For instance I am as much interested in results from > regions that have only a few probes, as I am interested in results from > those regions that are better served. When I look at the results so far > of a test measurement, it appears that I'm receiving results from 35 > probes in US, but only 3 from FI and none from NO. The latter surprises > me a bit since there are 100 probes reported in NO, so why aren't there > any results from those coming back? The main reason for this is that when you specify only WW the only criterion to pick a probe is how busy it is in terms of how many measurements probes is assigned. We don't try to make any balance (country/region/ASN/prefix) except how busy is it and which controller they are connected. > > While I understand that countries with more probes will likely yield > more results, I am wondering if there is any method to get a better > "country-balanced" result for measurements ran in "WW". I am afraid not at the moment. But, maybe there is something to consider for the future since I think other people have request it and we have internally discuss about it. > > Thanks, > > ~paul > Regards, Andreas
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