North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: latency vs. packet loss
Jon, > How well does latency correlate to packet loss on the Internet? For > example, if one were to pick one of several randomly placed sites on > the net based on lowest latency to/from point x, what percentage of > this time would this also yield the site with the lowest packet loss > to/from point x? My guess is that the correlation is high (due to > typical buffer sizes). Remember latency is also affected by other things, like distance (you won't get less than 70ms RTT NY<->Lon even on an empty STM-1), and to some extent things like line speed and traffic shaping (your 50 byte ping on a 1kb/s (empty) circuit will take 2*50*8/1000 = almost a second) to transmit. But this is stating the obvious. Also note there are some conditions which cause packet loss which won't cause ICMP latency (line errors, various IXP overload conditions etc.). -- Alex Bligh GX Networks (formerly Xara Networks)
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