RE: spin bit in QUIC: troubleshooting

[<[e-mail]>]

Hi Ian,

It was suggested in the latest discussion on the RTT design team mailing list to have one bit for packet lost, one for latency (spin bit or eq.) and one for congestion.
It seems a simplistic approach on one hand but an invariant on the long term.

Regards
Emile


De : Ian Swett [mailto:[e-mail]]
Envoyé : mardi 14 novembre 2017 22:51
À : STEPHAN Emile IMT/OLN
Cc : QUIC WG
Objet : 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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