Re: [Dime] Proposed resolutions of LOAD discussion

<lionel.morand@orange.com> Mon, 19 September 2016 22:07 UTC

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From: <lionel.morand@orange.com>
To: Steve Donovan <srdonovan@usdonovans.com>, "dime@ietf.org" <dime@ietf.org>
Thread-Topic: [Dime] Proposed resolutions of LOAD discussion
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Date: Mon, 19 Sep 2016 22:07:11 +0000
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Subject: Re: [Dime] Proposed resolutions of LOAD discussion
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> Primary Issues:
> 
> 1) Use of DNS SRV weighted value as format for LOAD value.
> 
> This was discussed and agreed to early in the process.  It has the advantage that
> Diameter nodes can use a combination of values received via the DNS SRV
> interface and dynamic values received through the Diameter LOAD interface.
> While I agree that it isn't as intuitive as a straight percentage value, I don't see
> this as compelling enough of a reason to change a decision the working group
> has already made.

[LM] ok to keep DNS SRV weighted value type.

> 
> 2) Need to add wording that the calculated LOAD value needs to be based on
> overall available capacity.
> 
> I agree with Maria Cruz's comment that we need to add wording indicating that
> the calculated LOAD value needs to reflect available capacity.  To this end, I
> propose adding the following to section 6.1 (this is based on wording proposed
> by Maria Cruz):
> 
> The calculated LOAD value MUST reflect the Diameter nodes capacity relative to
> the total available capacity across the Diameter nodes to which requests can be
> routed.  This could be either a set of Diameter endpoints or a set of Diameter
> agents, depending on the type of the LOAD report.  The method for determining
> the total available capacity is outside of the scope of this document.
> 
>     Note: The LOAD value should be calculated in a way that reflects the available
> load independently of the weight of each
>     server.  This allows the Diameter node that routes a request, including nodes
> doing server selection and agents routing
>     requests, to accurately compare values from different nodes.  Any specific
> LOAD value needs to identify  the same
>     amount of available capacity, regardless the Diameter node that calculates
> the value.
> 
> The mechanism used to calculate the LOAD value that fulfills this requirement is
> an implementation decision.

[LM] see other email.

> 
> 3) Wording in Appendix A.
> 
> Before we reword Appendix A, we need to decide if it is still needed.
> It was valuable in helping to generate the solution but I'm not convinced it is still
> needed in the document.  Is there objection to removing this section?

[LM] if it is only for information, we can just remove them. If someone identifies important aspects that need to be kept, it would mean that the body is not self-consistent. If we keep it, we will have to ensure that the content is correct, even if informative, as the appendix is reviewed during IETF LC as any other part of the document and it would be painful to trigger useless discussions on a pure informative part.
> 
> 
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