From: Yuchung Cheng <ych...@google.com> Date: Thu, 9 Aug 2018 09:38:08 -0700
> This patch is a follow-up feature improvement to the recent fixes on > the performance issues in ECN (delayed) ACKs. Many of the fixes use > tcp_enter_quickack_mode routine to force immediate ACKs. However the > routine also reset tracking interactive session. This is not ideal > because these immediate ACKs are required by protocol specifics > unrelated to the interactiveness nature of the application. > > This patch set introduces a new flag to send a one-time immediate ACK > without changing the status of interactive session tracking. With this > patch set the immediate ACKs are generated upon these protocol states: > > 1) When a hole is repaired > 2) When CE status changes between subsequent data packets received > 3) When a data packet carries CWR flag This looks really nice, series applied. Thanks!