What DNS Is Not

bmanning at vacation.karoshi.com bmanning at vacation.karoshi.com
Sun Nov 8 18:46:48 CST 2009


On Sun, Nov 08, 2009 at 07:42:18PM -0500, David Andersen wrote:
> 
> On Nov 8, 2009, at 7:30 PM, bmanning at 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
> >
> >	            -----------
> >> -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

	I'm not debating the traces - I wonder about the simulation
	model.  (and yes, I've read the paper)

--bill




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