maskit commented on issue #8199:
URL: https://github.com/apache/trafficserver/issues/8199#issuecomment-904296163


   I'm saying it may be due to a bug or poor implementation in window control 
if increasing `initial_window_size_in` doesn't work for your case. Having a 
setting for session window size and set it to a very big number sound like you 
are effectively removing window control for sessions.
   
   It is unclear to me that the issue is caused by the sender side or the 
receiver side. In other words, the both giving insufficient window and using 
given window poorly can cause the issue.
   
   Current implementation gives streams chances to send data equally (if stream 
priority is not specified). However, there's no guarantee that a stream can 
actually send data when the stream get a chance, because stream/session window 
may be 0. If there are many streams, the stream may have to wait for next 
chance for a bit long time. And it's possible that there are unfortunate 
streams that can't send any data for very long time.


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