This patch set refactors the sequence of congestion control, loss recovery, and transmission logic in TCP ack processing.
The design goal is to decouple and sequence them in the following order: 0. ACK accounting: free or tag sent packets [unchanged] 1. loss recovery: identify lost/ecn packets and update congestion state 2. congestion control: up/down cwnd and pacing rate based on (1) 3. transmission: send new or retransmit old based on (1) and (2) This refactoring makes the cwnd changes more clear because it's done in one place. The packet accounting is also more robust especially for connections that do not support SACK. Patch 1-4 and 6 are refactoring and patch 5 improves TCP performance under reordering. Yuchung Cheng (6): tcp: retransmit after recovery processing and congestion control tcp: move cwnd reduction after recovery state procesing tcp: new delivery accounting tcp: refactor pkts acked accounting tcp: make congestion control more robust against reordering tcp: tcp_cong_control helper include/linux/tcp.h | 1 + net/ipv4/tcp_input.c | 149 +++++++++++++++++++++++++++++++++------------------ 2 files changed, 98 insertions(+), 52 deletions(-) -- 2.7.0.rc3.207.g0ac5344
