Are congestion windows for QUIC per stream of per connection?

[Jelte Fennema]

When reading the RFC it is not really clear to me if congestion control is done per stream or per connection: https://tools.ietf.org/html/draft-tsvwg-quic-protocol-02#section-5.2

Could someone tell me for which of the two it is done?

[Robbie Shade]

Yeah I guess that's not clear, but congestion control is per connection.

There are some thoughts about adapting congestion control based on number of open streams, to more closely emulate multiple parallel TCP connections, but I believe that's currently not used (others may correct me here!). It would still ultimately be congestion control at the connection level though, just with differently sized window changes.

There are some code comments that may be helpful in cubic.cc:

https://code.google.com/p/chromium/codesearch#chromium/src/net/quic/congestion_control/cubic.cc&l=54

On Tue, May 31, 2016 at 9:17 AM, Jelte Fennema <m...@jeltef.nl> wrote:

When reading the RFC it is not really clear to me if congestion control is done per stream or per connection: https://tools.ietf.org/html/draft-tsvwg-quic-protocol-02#section-5.2

Could someone tell me for which of the two it is done?

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