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North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: Network for Sale
In message <[email protected]>, Paul A Vixie writes: > >>> Oh god, I hope not. RTT has never been an accurate predictor of end-to-end >>> performance. (Just ask anyone who bought into ping-based global server load >>> balancing.) ASPATH length is almost as bad (as a predictor) as RTT. >> >> well, it's the way icmp_echo is handeld in some vendor routers and >> sometime also the poor implementation of an IP stack on the echoing >> device which is a problem. > >no, that is not the problem. oh i admit that ping time jitter is ~random. >but even if it weren't, RTT doesn't drive performance, (bw*delay)-loss does. > And how does "delay" differ from RTT, except for the obvious constant factor? --Steve Bellovin, http://www.research.att.com/~smb
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