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dns performance evaluation

at anil's request, some pointers to the scripts used to generate dns 
performance eval plots for the asplos paper...

the scripts are in <https://github.com/mor1/mirage-perf/tree/master/dns/bin>. 
they're *very* hacky - i take no responsibility if you feel queasy reading them 

in outline:

* setup.sh pulls and builds the necessary tarballs locally (notably bind, nsd 
and the bind tools of which dnsperf is one)

* setup-xen-images.sh creates the xen VM images that i used (not necessary if 
just doing the tests on unix; although i don't think the scripts directly 
support that now because i never had to do that)

* generate.sh runs the dns-perf perl scripts etc to generate the necessary test 
zone files, etc

* run.sh runs the tests -- this involves firing up VMs and invoking commands on 
them via ssh; again, can be dramatically simplified if you're just testing 
direct on unix

the config inputs to the scripts are in 
<https://github.com/mor1/mirage-perf/tree/master/dns/app> contains the mirage 
code implementing the DNS server -- it's a separate app because it uses the 
crunch fs to build an app with the zonefile statically included. 

let me know if you have any questions...



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