Re: [manet] Magnus Westerlund's Discuss on draft-ietf-manet-dlep-pause-extension-06: (with DISCUSS)
Lou Berger <lberger@labn.net> Thu, 11 April 2019 11:47 UTC
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To: Magnus Westerlund <magnus.westerlund@ericsson.com>, "Ratliff, Stanley" <sratliff@idirect.net>, The IESG <iesg@ietf.org>
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From: Lou Berger <lberger@labn.net>
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Subject: Re: [manet] Magnus Westerlund's Discuss on draft-ietf-manet-dlep-pause-extension-06: (with DISCUSS)
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Magnus, On 4/5/2019 5:11 AM, Magnus Westerlund wrote: > Hi, > > Thanks for the replies. > > I think the main point here is if one should treat router + modem as one > common queue when it comes to meeting PHBs or treat them as two in > sequence queues. If one treat them as two queues then you get the same > behavior as two routers in sequence. And that is acceptable from one > angle, but it also results in additional jitter and latencies. I think Stan's response already covered the above. From my perspective, I agree with stan that a modem that reports DSCPs should be expected to honor them like any other transit IP device (router, middlebox, etc.). I think that the following is possible in the non-diffserv modem aware case - but another approach would be to not deploy such limited modems in a network that requires DSCP support - just like you wouldn't deploy a router that doesn't support a particular PHB in network that expects to support it. > > If we take the Expedited Forwarding PHB (RFC 3246) treating this as two > queue results in that the error is E_a1 (router) + E_a2 (mode) rather > than a E_a for the combined queue. The question is if E_a actually will > be smaller than E_a1+E_a2 when one uses this type of control? In the > combined case if the modem queue is so shallow that E_a2 << E_a1 as well > as that time for performing the DLEP signalling is so short that the > main variations ends up being in the router queue where one can apply > suitable policies to control queue load to prevent violation of the > targets. > I think my main concern will be what happens if one attempts to > implement L4S dual queues or DETNET and have DLEP in the path. Will this > require additional extensions to provide more detailed flow control > information so that lower latency or more deterministic behavior can be > achieved? Quite likely -- I think this is not the flow control you'd want with DetNet (I can't speak to L4S), i'd personally use something like what's covered in ietf-manet-dlep-da-credit-extension. > I noticed that TSVART reviewer Bob Briscoe asked for a use case > description of the case when the main queue is pushed to the router. I > think that appears to be a good idea. I think what I am wondering is if > there need to be some applicability statement here due the limitations > of the technology? I certainly have no objection to such, particularly given ietf-manet-dlep-da-credit-extension. If you have any suggested text, that would be helpful. Otherwise, as I mentioned in response to Bob, if really needed I can work with the Shepherd/WG on some applicability text. Lou > Cheers > > Magnus > >
- [manet] Magnus Westerlund's Discuss on draft-ietf… Magnus Westerlund via Datatracker
- Re: [manet] Magnus Westerlund's Discuss on draft-… Lou Berger
- Re: [manet] Magnus Westerlund's Discuss on draft-… Ratliff, Stanley
- Re: [manet] Magnus Westerlund's Discuss on draft-… Magnus Westerlund
- Re: [manet] Magnus Westerlund's Discuss on draft-… Lou Berger
- Re: [manet] Magnus Westerlund's Discuss on draft-… Magnus Westerlund
- Re: [manet] Magnus Westerlund's Discuss on draft-… Lou Berger
- Re: [manet] Magnus Westerlund's Discuss on draft-… Magnus Westerlund
- Re: [manet] Magnus Westerlund's Discuss on draft-… Lou Berger
- Re: [manet] Magnus Westerlund's Discuss on draft-… Ratliff, Stanley