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RE: Hop-by-hop [not draft-han-6man-in-band-signaling-for-transport-qos-00.txt]

Lin Han <Lin.Han@huawei.com> Sat, 21 October 2017 01:15 UTC

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From: Lin Han <Lin.Han@huawei.com>
To: Brian E Carpenter <brian.e.carpenter@gmail.com>, "Manfredi, Albert E" <albert.e.manfredi@boeing.com>
CC: 6man WG <ipv6@ietf.org>
Subject: RE: Hop-by-hop [not draft-han-6man-in-band-signaling-for-transport-qos-00.txt]
Thread-Topic: Hop-by-hop [not draft-han-6man-in-band-signaling-for-transport-qos-00.txt]
Thread-Index: AQHTSdJXqSaZrOZDMkmbu8uyH2nDS6LtjQWA//++ciCAAKNsAP//jLNQ
Date: Sat, 21 Oct 2017 01:14:47 +0000
Message-ID: <1D30AF33624CDD4A99E8C395069A2A162CD76B4E@sjceml521-mbx.china.huawei.com>
References: <150774513036.24791.2138264254901122467@ietfa.amsl.com> <cc11634a-b5a2-88b9-f36f-82b3fd9d8d70@gmail.com> <1D30AF33624CDD4A99E8C395069A2A162CD734B2@sjceml521-mbx.china.huawei.com> <a4da4b26-6402-ad0d-a5f5-5bddc192b8f7@gmail.com> <4E40E3EF-B0E5-490E-BFF2-0511D97E9E80@employees.org> <CALx6S341v1zd2Q9bts8-zrKxU59kieJTJJ=nHQ5w4oQZg=t_cA@mail.gmail.com> <17525287-DDA8-4930-B90B-F9228DF69A90@employees.org> <CALx6S37wLvuJ9tUGjYmzm63eq_bxq0jXSEgfCtH_2i74SvrbLA@mail.gmail.com> <20171017181646.GD31973@faui40p.informatik.uni-erlangen.de> <e7da5913-1fd9-a476-e654-44cb5cfdc10c@gmail.com> <20171019212353.GC878@faui40p.informatik.uni-erlangen.de> <e4f7ea8b-ce0e-d829-7b1e-b53c3a890355@gmail.com> <e03ad50248824701bf3f6fbedcfa1ca4@XCH15-06-11.nw.nos.boeing.com> <1D30AF33624CDD4A99E8C395069A2A162CD768D2@sjceml521-mbx.china.huawei.com> <832bcad24c7844a08985b6a96f531a93@XCH15-06-11.nw.nos.boeing.com> <1D30AF33624CDD4A99E8C395069A2A162CD76A38@sjceml521-mbx.china.huawei.com> <5dc02378-28ff-e55a-6034-3faae396402f@gmail.com>
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>Keep your average network utilisation well below 10% and your QoS problems are solved.
>It's just queueing theory.

Kind of correct. If all links are never congested, there is no problem and requirement for QoS especially for bandwidth. But this is not practical for SP. In reality, there are always oversubscription at network aggregation device, such as TOR, PGW, BRASS, etc. Thus the congestion will never go away. Most of applications don’t feel pain if it is not bandwidth/latency sensitive, but for some applications, this may not be true anymore.
For latency requirement, it is not gone even the network load is below link capacity, so, the QoS is still required. 


Lin


-----Original Message-----
From: Brian E Carpenter [mailto:brian.e.carpenter@gmail.com] 
Sent: Friday, October 20, 2017 5:51 PM
To: Lin Han <Lin.Han@huawei.com>; Manfredi, Albert E <albert.e.manfredi@boeing.com>
Cc: 6man WG <ipv6@ietf.org>
Subject: Re: Hop-by-hop [not draft-han-6man-in-band-signaling-for-transport-qos-00.txt]

On 21/10/2017 12:27, Lin Han wrote:
...
> On the other hand, also in these controlled environments, another option, frequently, is to "throw bandwidth at the problem." Give yourself plenty of headroom. It's less elegant and less fun, but it works great.
> [LH] not completely get what you mean 

Keep your average network utilisation well below 10% and your QoS problems are solved.
It's just queueing theory.

   Brian

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