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Zone transfer performance

Bill Snow (UltraDNS) Description Zone update performance in large-scale DNS installations can be an important metric to pay attention to. Zone transfer performance measurements get less attention than query performance because it is less operationally acute, and because it is harder to measure, as has been discussed in previous presentations. Benchmarking zone transfer performance is the first and most important step, but more measurements of complex behaviour can also help to clarify performance considerations and optimizations. Taking a slightly different view of load generation in terms of concurrent connections, as is sometimes seen in HTTP load generation, experimental results will compare update rate performance between selected nameserver implementations and installations. Supporting data and qualitative observations from UltraDNS systems will be used to describe differences in nameserver behaviour, and limitations on performance. A variety of data conditions including size and number of updates to catalog and member zones, and installation topology will be included. The presentation will highlight differences in implementations and possible tuning opportunities, installation choices, future development, and performance test concepts. This may help current and future operators to consider zone transfers where alternative data propagation has been used the past.