PENG, JUNAN <jp2...@att.com> wrote: > I need to start by saying that my load testing is very unscientific, so I can only give you a few handwaving hints...
> I did recursive query capacity test. I used traffic generator to place > 15K QPS traffic to DNS 1 with FQDN1 (Note, FQDN1 can't be resolve by > DNS1, it need to forward it to DNS2 and TTL is set to 0) In my experience, 15kqps is easy to achieve with a hot cache, but if you are forcing the resolver to make recursive queries you'll be sacrificing a lot of the potential performance (but I can't give you numbers on how much). Set the TTL to a non-zero value to get a more realistic test. > Thing 1. DNS query number is larger than response number between > traffic generator and DNS1 . About 15% traffic are dropped by DNS1 . Are you hammering the same qname or a small number of qnames? If so I would expect the server to drop queries while it is recursing - look at the documentation for max-clients-per-query. > Thing 2. DNS recursive query number between DNS1 and DNS2 is far less > than query number between traffic generator and DNS1 That's kind of the point of a cache :-) Tony. -- f.anthony.n.finch <d...@dotat.at> http://dotat.at/ public services available on equal terms to all _______________________________________________ Please visit https://lists.isc.org/mailman/listinfo/bind-users to unsubscribe from this list bind-users mailing list bind-users@lists.isc.org https://lists.isc.org/mailman/listinfo/bind-users
