[CCAMP] Fwd: Re: Fwd: Re: WG Last Call: draft-ietf-ccamp-dpm

[Al Morton <[e-mail]>]

Lou and Deborah,

As requested, my brief review of the dpm draft is below.
I've also asked for a Performance Metrics Directorate volunteer
who could review the draft quickly. If another review is coming,
I'll let you know.

Al


>Date: Sat, 19 May 2012 10:06:22 -0400
>To: Lou Berger <[e-mail]>
>From: Al Morton <[e-mail]>
>Subject: Re: Fwd: Re: [CCAMP] WG Last Call: draft-ietf-ccamp-dpm
>Cc: "BRUNGARD, DEBORAH A (ATTLABS)" <[e-mail]>
>
>Hi Lou,
>
>I took a quick look this morning, the authors have nicely adopted
>the familiar metric framework used in other performance work,
>and I like the metric naming - very straightforward to sort out
>the names once you read the explanation in section 3,
>although they could say explicitly how they've done it, so it lends
>to extension in the future.
>
>I would suggest they give the acronym expansion in each section.
>for example:
>
>
>>5.2.  Metric Name
>>
>>    RRFD  =  RESV Received, Forward Datapath
>
>
>One word choice in section 1 could be improved:
>
>
>>
>>    This document defines a series of performance metrics to evaluate the
>>    availability of data path during the signaling process.
>
>I would suggests/availability/connectivity/
>
>"availability" has many more rigorous definitions than the
>test pattern used here.
>
>A minor concern:
>It seems that the length of the test signal will influence
>the delay measurement, the simple serialization time for bits
>in the first packet of the signal, which it seems could be a
>Jumbo packet. This should be mentioned as it is applicable as
>a potential source of error for all the metrics. I realize this may
>be negligible on high speed interfaces using a single packet for
>the test signal - but they've left the option for long test
>signals. There is clear motivation to use small packets from a
>performance-bias perspective.
>
>-=-=-=-=-=-=-
>
>In recent news, the Performance Metrics Directorate has been formed
>in the OPS area, and we review drafts when WG chairs request.
>As PMDir Admin, I'd be glad to ask for a review volunteer.
>Let me know.
>
>We usually try to do early review of WG doc candidates rather
>than WG Last Call, simply because the feedback might be extensive.
>http://www.ietf.org/iesg/directorate/performance-metrics.html
>
>hope this helps,
>Al