Re: [Detnet] extending DetNet Flow TSpec in the flow information draft
Balázs Varga A <balazs.a.varga@ericsson.com> Tue, 01 December 2020 13:53 UTC
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From: Balázs Varga A <balazs.a.varga@ericsson.com>
To: 'DetNet WG' <detnet@ietf.org>
Thread-Topic: extending DetNet Flow TSpec in the flow information draft
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Date: Tue, 01 Dec 2020 13:53:20 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/detnet/AQ6camS74dYKQTMIS6yIAooEF9w>
Subject: Re: [Detnet] extending DetNet Flow TSpec in the flow information draft
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Hi, Thanks for sorting this out. I am fine with the proposed text. Unless objection, I add this text below to the new version of the flow info draft. Thx & Cheers Bala'zs From: detnet <detnet-bounces@ietf.org> On Behalf Of Janos Farkas Sent: Monday, November 30, 2020 10:32 PM To: 'DetNet WG' <detnet@ietf.org> Subject: [Detnet] extending DetNet Flow TSpec in the flow information draft Hi, It was pointed out during the discussions on the packet ordering fucntion, that the current Traffic Specification of the DetNet Flow may not be enough for latency engineering if the Packet Ordering Function is applied, e.g., https://mailarchive.ietf.org/arch/msg/detnet/4QZw2Qauqyrse5ZptVmttuszhIA/: "this specification is good when one like ensure capability can handle the traffic by specifying the maxmimum kind of resource the flow will consume. But it doesn't work for calculate a bounded delay as by lowering the number of packets per second actually sent, the actual latency increases in the POF if it is configured only on number of packets. To bound latency based on number of packets, in that case you have to enforce that the flow have a minimal packet interval." Along the lines of the proposal in the same thread: https://mailarchive.ietf.org/arch/msg/detnet/fhSqDPp6g42tKcQdjv3FMwxgwwU/: " I agree that minimum sized frames are needed as well. Please see the text I proposed in my last message and note that the reference traffic specification (RFC2212) includes a minimum policed unit (m), and the maximum datagram size (M)." To address this, two new attributes are suggested to be added to Section 5.5. Traffic Specification of the DetNet Flow (https://tools.ietf.org/html/draft-ietf-detnet-flow-information-model-11#section-5.5): NEW text to be added right after item c: d. MinPayloadSize: the minimum payload size that the Ingress will transmit. e. MinPacketsPerInterval: the minimum number of packets that the Ingress will transmit in one Interval. When MinPayloadSize and MinPacketsPerInterval parameters are used, then all packets less than the MinPayloadSize will be counted as being of the size MinPayloadSize during packet processing when packet size matters, e.g., when policing; and all flows having less than MinPacketsPerInterval will be counted as having MinPacketsPerInterval when the number of packets per interval matters, e.g., during resource reservation. However, flows having less than MinPacketsPerInterval may result in a different network behavior than the DetNet network has been engineered for. MinPayloadSize and MinPacketsPerInterval parameters, for example, may be used when engineering the latency bounds of a DetNet flow when POF is applied to the given DetNet flow. Comments are welcome. Best regards, Janos
- [Detnet] extending DetNet Flow TSpec in the flow … Janos Farkas
- Re: [Detnet] extending DetNet Flow TSpec in the f… Balázs Varga A