Re: [aqm] thoughts on operational queue settings (Re: [tsvwg] CC/bleaching thoughts for draft-ietf-tsvwg-le-phb-04) (fwd)

Jonathan Morton <chromatix99@gmail.com> Thu, 12 April 2018 07:21 UTC

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From: Jonathan Morton <chromatix99@gmail.com>
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Date: Thu, 12 Apr 2018 10:21:48 +0300
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To: Mikael Abrahamsson <swmike@swm.pp.se>
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Subject: Re: [aqm] thoughts on operational queue settings (Re: [tsvwg] CC/bleaching thoughts for draft-ietf-tsvwg-le-phb-04) (fwd)
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> On 12 Apr, 2018, at 9:46 am, Mikael Abrahamsson <swmike@swm.pp.se>; wrote:
> 
> I sent this to tsvwg where we're discussing the LE codepoint. Since I am now talking queue settings, I thought it might be interesting to get feedback from this group as well on what advice we should give operators.
> 
> Please take into account that I am aiming for what is possible on currently deployed platforms, seen in the field. Not what might be possible on future hardware/software. So available are generally (W)RED per queue and a few queues per customer.
> 
> I am also going to test a 3 queue setup, where each of these groups of DSCP values would go into different queues where LE would perhaps be assured 5% of BW and the rest split evenly between a BE and "everything else" queue. If I did that, I would probably not start dropping LE traffic until 10-20ms buffer fill.

Given the stated constraints, this looks reasonable to me.  Better to have some basic AQM than a purely dumb FIFO.

Better still, of course, to have something more modern...

 - Jonathan Morton