Re: [sr-dev] git:master: dns: srv load balancing distribution fix

The load distribution when doing SRV based load balancing was not completely fair. The first listed server had always an extra  (sum_of_weights-weight)/(sum_of_weights*(sum_of_weights+1) chance of being selected. For example for 2 servers both with weight 50, the first one will have an extra (100-50)/100*101 change of being selected =>  extra 0.495% which gives a 50.495% - 49.505% distribution instead of 50% - 50%. For large weight values this doesn't make a big difference (e.g. for 500-500 => 50.049% instead of 50%) but for small values it becomes very noticeable (e.g. for 1-1 =>  66% - 33% distribution instead of 50%-50%). The chance of selecting a 0-weight record was also changed. It was  1/(sum_of_weights+1) and now is 1/(sum_of_weights*1000). Reported-by: Michal Matyska  michal.matyska iptel org