[58440] in North American Network Operators' Group
Is latency equivalent to RTT?
daemon@ATHENA.MIT.EDU (Michael.Dillon@radianz.com)
Wed May 14 10:02:52 2003
To: nanog@merit.edu
From: Michael.Dillon@radianz.com
Date: Wed, 14 May 2003 15:01:06 +0100
Errors-To: owner-nanog-outgoing@merit.edu
Has it become common usage to define latency in an IP network as the round
trip time in that network?
I've always considered latency to be a one-way measure of delay and RTT to
be the sum of the latencies in both directions. When I tried to find
something to back up this view, I discovered that a number of companies
define latency as equivalent to RTT in their SLAs.
Assuming that one has measuring devices in every PoP, do you think it is
harder to measure a full matrix of one way latency compared to measuring a
full matrix of RTT?
Does it even make sense to measure a full matrix of RTT when the
measurement of A to B to A should be equivalent to the measurement of B to
A to B?
--Michael Dillon
