On Wed, Feb 18, 2015 at 10:22 AM, Rob Seastrom <r...@seastrom.com> wrote: > The Pi is low-powered in more ways than one. Last fall I ran some > (admittedly fairly simple minded) DNS benchmarks against a Raspberry > Pi Model B and an ODROID U3. > > Particularly if you have DNSSEC validation enabled, the Pi is > underwhelming in performance (81 qps in the validation case, 164 > without). > > The U3 is circa 325 qps with or without DNSSEC validation on, which > suggests that something else other than crypto-computes is the long > pole in the tent.
Hi Rob, Interesting. The odroid has a 1700 mhz processor, the pi a 700 mhz processor. Except for the validation anomaly your results are self-consistent. > Caveats: This is just returning NXDOMAIN against a TLD for which > (after the first run) there is already cached information that the TLD > is bogus, so this test doesn't involve traffic actually leaving the box. Given your testing methodology, the difference between validating and non-validating makes no sense to me. Once the records are cached bind should only be passing a flag around? Weird. On Wed, Feb 18, 2015 at 6:44 PM, Peter Loron <pet...@standingwave.org> wrote: > For any site where you would use a Pi as the DNS cache, it won't be an > issue. DNS isn't that heavy at those query rates. Yes and no. DNS is a lynchpin service. All connections stall until the DNS provides an IP address. So you kinda want low latency in your DNS lookups. If a fast server three hops away can respond faster than a slow server on the same LAN, the server three hops away is a better choice. A point in favor of the Raspberry Pi -- there's a heckuva lot of accessories already built for it. Including various cases and even a few different rackmount cases. And a wealth of "how do you do it?" and "why did it do this?" information available with just a few google search terms. The communities supporting the other hardware options are not nearly so large. Regards, Bill Herrin -- William Herrin ................ her...@dirtside.com b...@herrin.us Owner, Dirtside Systems ......... Web: <http://www.dirtside.com/>
