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Re: [PMOL] FW: [bmwg] Soliciting comments on GMPLS performance metrics draft inCCAMP
Hi all,
> Hi IPPMers and BMWGers,
> Recently the LSP dynamic provisioning performance draft is adopted as a
> working item of CCAMP.
Some comments, reading this as a non-expert on GMPLS.
3.4. Units.
I don't think this is quite correct: you start to measure at T1 and
wait for the setup to complete. However, it doesn't, so at some point
you become bored and stop the measurement. You report undefined.
However, one then has to report in the metrics parameters when the
measurement will be stopped. This value should be added to the
metrics parameters. (Note: this will apply to more metrics).
4.3. Metrics Parameters.
In IPPM speak, Lamba refers to a rate but it also specifies a distribution
for the interval between probe packets. For example, poisson or periodic.
The draft should mention which distribution to use.
12.1. Statistics.
I think you better report the 5th or 10th percentile of the distributions,
rather than the minimum (and the same for the maximum). This excludes
data points where something went wrong in the measurement process.
Henk
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Henk Uijterwaal From pmol-bounces at ietf.org Thu Jun 5 03:04:14 2008
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Date: Thu, 05 Jun 2008 12:04:09 +0200
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Cc: Weiqiang Sun <sunwq at sjtu.edu.cn>, pmol at ietf.org
Subject: Re: [PMOL] FW: [bmwg] Soliciting comments on GMPLS performance
metrics draft inCCAMP
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Hi all,
> Hi IPPMers and BMWGers,
> Recently the LSP dynamic provisioning performance draft is adopted as a
> working item of CCAMP.
Some comments, reading this as a non-expert on GMPLS.
3.4. Units.
I don't think this is quite correct: you start to measure at T1 and
wait for the setup to complete. However, it doesn't, so at some point
you become bored and stop the measurement. You report undefined.
However, one then has to report in the metrics parameters when the
measurement will be stopped. This value should be added to the
metrics parameters. (Note: this will apply to more metrics).
4.3. Metrics Parameters.
In IPPM speak, Lamba refers to a rate but it also specifies a distribution
for the interval between probe packets. For example, poisson or periodic.
The draft should mention which distribution to use.
12.1. Statistics.
I think you better report the 5th or 10th percentile of the distributions,
rather than the minimum (and the same for the maximum). This excludes
data points where something went wrong in the measurement process.
Henk
--
------------------------------------------------------------------------------
Henk Uijterwaal Email: henk.uijterwaal(at)ripe.net
RIPE Network Coordination Centre http://www.amsterdamned.org/~henk
P.O.Box 10096 Singel 258 Phone: +31.20.5354414
1001 EB Amsterdam 1016 AB Amsterdam Fax: +31.20.5354445
The Netherlands The Netherlands Mobile: +31.6.55861746
------------------------------------------------------------------------------
Is one of the choices leaving the office open?
Alan Greenspan on the next elections
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Email: henk.uijterwaal(at)ripe.net
RIPE Network Coordination Centre http://www.amsterdamned.org/~henk
P.O.Box 10096 Singel 258 Phone: +31.20.5354414
1001 EB Amsterdam 1016 AB Amsterdam Fax: +31.20.5354445
The Netherlands The Netherlands Mobile: +31.6.55861746
------------------------------------------------------------------------------
Is one of the choices leaving the office open?
Alan Greenspan on the next elections
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