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Re: Ping triangulation
- From: Todd Graham Lewis
- Date: Sun Jul 28 00:09:05 1996
On Sat, 27 Jul 1996, Roy wrote:
> They use the ping times to figure out which server would be closest.
> All the servers are not located in the same place. The idea is that
> european users may receive better service from a european server.
This brings to mind a question: are ping times a more appropriate vector
than hopcount or topological locality? Ping times reflect a lot of
important (but ephemeral) aspects of performance which more direct
measurements do not. E.g., the latency of trans-pond links nicely
reflects their cost in a matter not easily captured in simple topology
maps. Ditto for congested links which might be closer to the viewer.
Of course cacheing solves all of these problems (J <- hook next to bait),
but in this imperfect of worlds, what reasons, if any, make ping time
less attractive than other metrics? I used to think them simple-minded
and sloppy, but now I am not so sure.
_____________________________________________________________________
Todd Graham Lewis Linux! Core Engineering
Mindspring Enterprises tlewis@mindspring.com (800) 719 4664, x2804
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