Re: [Dime] Mirja Kühlewind's Discuss on draft-ietf-dime-drmp-05: (with DISCUSS and COMMENT)

Alexey Melnikov <aamelnikov@fastmail.fm> Wed, 04 May 2016 11:32 UTC

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From: Alexey Melnikov <aamelnikov@fastmail.fm>
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Date: Wed, 4 May 2016 12:37:46 +0100
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To: Mirja Kuehlewind <ietf@kuehlewind.net>
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Cc: draft-ietf-dime-drmp@ietf.org, dime-chairs@ietf.org, dime@ietf.org, The IESG <iesg@ietf.org>
Subject: Re: [Dime] =?utf-8?q?Mirja_K=C3=BChlewind=27s_Discuss_on_draft-ietf-d?= =?utf-8?q?ime-drmp-05=3A_=28with_DISCUSS_and_COMMENT=29?=
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Hi Mirja,

> On 4 May 2016, at 12:13, Mirja Kuehlewind <ietf@kuehlewind.net> wrote:
> 
> However, the one part that does actually concern me is:
> "When using DRMP priority information, Diameter nodes MUST use the
>   default priority for transactions that do not have priority specified
>   in a DRMP AVP."
> This part seems dangerous and I would proposed to instead basically have
> to different queues: one if a priority is defined and another one for
> requests without priority indication to make sure that requests out of
> the second queue will be served at some point in time and cannot be
> starved by other low priority requests completely.

I think I disagree with you: default priority handling is orthogonal to the number of queues used. Some implementations would use one queue per priority, so you are effectively suggesting that no priority is treated as its own priority. I think this is an implementation detail.