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farrokhi / dnsdiag

DNS Measurement, Troubleshooting and Security Auditing Toolset
https://dnsdiag.org/
BSD 2-Clause "Simplified" License
939 stars 99 forks source link

dnseval: send one query before starting the comparison #40

Open webernetz opened 6 years ago

webernetz commented 6 years ago

Hi Babak,

I am currently testing a few DNS servers with dnseval. One suggestion: Since it tests basically the "cache hit" rate it makes a huge difference whether the requested hostname is already in the cache of the DNS resolver or not. If it is in the cache, all responses are fast. If it is not in the cache, the very first query is slow while all further queries are fast. Hence my idea: Could you send a first query to the resolver (in order to have the hostname in the cache), wait a few moments (let's say, 1 second) and then start the actual dnseval test of the servers? To my mind this would give better comparable results.

Ciao, Johannes

farrokhi commented 6 years ago

Thanks for the suggestion. My initial idea is to add an optional warmup and exclude it from the measurement.

webernetz commented 6 years ago

Yeah, or a "no-warmup" option to have the warmup by default. ;)