RE: spin bit in QUIC: troubleshooting

[<[e-mail]>]

+1

De : Salvatore Loreto [mailto:[e-mail]]
Envoyé : mercredi 15 novembre 2017 00:54
À : Marcus Ihlar; Roni Even
Cc : Ian Swett; QUIC WG; STEPHAN Emile IMT/OLN
Objet : RE: spin bit in QUIC: troubleshooting

+1
Latency is the most crucial component needed in Quic version 1

Also considering the fact that QUIC will be either most likely adopted in 3GPP for 5G SBA
and the majority of the traffic in 5G networks QUIC (per Georg Mayer mail on those points)
Operators will have to make sure to keep the latency really low in 5G networks and they
will be measured on latency.

/Sal

From: QUIC [mailto:[e-mail]] On Behalf Of Marcus Ihlar
Sent: den 14 november 2017 17:21
To: Roni Even <[e-mail]<mailto:[e-mail]>>
Cc: Ian Swett <[e-mail]<mailto:[e-mail]>>; QUIC WG <[e-mail]<mailto:[e-mail]>>; [e-mail]<mailto:[e-mail]>
Subject: Re: spin bit in QUIC: troubleshooting

+1 on Ronis statement below.
Let us begin with latency, which is the most crucial component to have in place.
As V1 gets deployed we will get a better understanding of what else might be needed.

On 14 Nov 2017, at 23:27, Roni Even <[e-mail]<mailto:[e-mail]>> wrote:
I think that latency is what we need right now.
Once we understand more about quic and packet loss (will ECN be used reducing packet loss) and other functionality we can see what else is needed. This may be done in next version using variants.
Roni

From: QUIC [mailto:[e-mail]] On Behalf Of Ian Swett
Sent: יום ג 14 נובמבר 2017 16:51
To: [e-mail]<mailto:[e-mail]>
Cc: QUIC WG
Subject: Re: spin bit in QUIC: troubleshooting

What would the other bit or two be used for?  If there is no standardized use of those bits in v1, then I believe we should wait to reserve them when their usage is defined, given we'd need a version bump to specify how they were being used.  At the moment, the management use case is not competing with anyone else for bits in the short header.

On Tue, Nov 14, 2017 at 5:14 AM, <[e-mail]<mailto:[e-mail]>> wrote:
Hi

Last week Orange experienced a fallback of QUIC to TCP on one of its networks. The issues were not visible in QUIC traffic. The troubleshooting was made using TCP packets information. This is not sustainable on the long term when numerous applications using different versions of QUIC will stop to fallback to TCP.

Based on the exchange we had in the RTT design team and in today meeting , it sounds reasonable to reserve at least 2 bits (ideally 3 bits as discussed in the design team) for manageability in the QUIC invariants and to start experimenting the spin bit in QUIC V1.

Regards
Emile


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