On Nov 8, 2009, at 7:30 PM, bmanning@vacation.karoshi.com wrote:
On Sun, Nov 08, 2009 at 07:17:16PM -0500, David Andersen wrote:
"Our trace-driven simulations yield two findings. First, reducing the
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-Dave
a simulation is driven from a mathmatical model, not real world constructions.
Hi, Bill - The paper is worth reading. "The paper also presents the results of trace-driven simulations that explore the effect of varying TTLs and varying degrees of cache sharing on DNS cache hit rates. " emphasis on *trace-driven*. Now, you can argue whether or not their traces are representative (whatever that means) -- they used client DNS and TCP connection traces from MIT and KAIST, so it definitely has a .edu bias, iff there is a bias in DNS traffic for universities vs. "the real world", but to the extent that their traces represent what other groups of users might see, their evaluation seems accurate. -Dave