Bind 9.1.3 stop resolving but is still running.

[Brad Knowles]

At 11:24 AM -0700 9/5/01, Nate Campi wrote:

>  I also wonder if part of the poor performance in BIND 9 (when it is
>  actually answering queries) is due to the three tries against remote
>  nameservers to see if they handle EDNS0. Can this be turned off?

	I've been thinking about this some more, and I recall that the 
EDNS0 probes are done on a one-time-only/per-nameserver basis, and 
the results are cached for the life of the named process (i.e., the 
probes won't be sent again until BIND is restarted).

	I'd be very interested to know what your testing results might 
be, if you were to follow a regime more similar to what Matt Simerson 
was doing, so that you do a full test run with a clean cache, then 
repeat the test run again with a primed cache, and do this sequence 
several times in sequence, in order to try to average out individual 
ideosyncracies.


	Search the archives of this list for more posts by Matt, and also 
take a look at the testing methodology used by Rick Jones in his 
various papers at <ftp://ftp.cup.hp.com/dist/networking/briefs/>.

>  Is BIND 9 even up the the task of replacing BIND 8 on heavily loaded
>  boxes? From my tests so far, it cannot replace our current public DNS
>  servers, or even caching servers for internal use - due to poor
>  performance.

	Rick has tested only the authoritative performance of BIND 9, but 
I believe that his tests have clearly shown that, on the right 
hardware, it can handle at least 12,000 DNS queries per second in 
that mode, and I have to believe that it can also handle on roughly 
the same order of queries per second for caching (barring any 
Internet latency issues).

	There is no question in my mind that a properly configured 
nameserver machine running a properly compiled (with the vendor 
compiler) and installed BIND 9 is more than suitable for most any 
nameserver task you may throw at it.

-- 
Brad Knowles, <brad.knowles at skynet.be>

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