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Re: [Teas-ns-dt] Isolation

Stewart Bryant <stewart.bryant@gmail.com> Tue, 11 February 2020 06:17 UTC

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From: Stewart Bryant <stewart.bryant@gmail.com>
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Date: Tue, 11 Feb 2020 07:17:14 +0100
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To: John E Drake <jdrake=40juniper.net@dmarc.ietf.org>
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Subject: Re: [Teas-ns-dt] Isolation
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Sent from my iPad

> On 10 Feb 2020, at 17:19, John E Drake <jdrake=40juniper.net@dmarc.ietf.org> wrote:
> 
> Performance isolation - a customer's performance related SLO parameters will not be degraded by more than X, where X is a percentage in the range of 0 to some higher percentage, as specified in the SLO

Performance isolation can be quite subtle.

An effect that was found in the testing of high quality time distribution concerned the beating of two almost in sync sources. What happened was that A led B, with B going slightly faster than A. The when B overtook A, A suffered a phase hit.

It is also worth looking at the Detnet Security Framework where we have been trying to understand the dynamics.

Stewart

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