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01fcbd6c08
The ->app_limited member of the delivery rate struct (quic_cc_drs) aim is to store the index of the last transmitted byte marked as application-limited so that to track the application-limited phases. During these phases, BBR must ignore delivery rate samples to properly estimate the delivery rate. Without such a patch, the Startup phase could be exited very quickly with a very low estimated bottleneck bandwidth. This had a very bad impact on little objects with download times smaller than the expected Startup phase duration. For such objects, with enough bandwith, BBR should stay in the Startup state. No need to be backported, as BBR is implemented in the current developement version.