This patch set removes the forward-acknowledgment (FACK) packet-based loss and reordering detection. This simplifies TCP loss recovery since the SACK scoreboard no longer needs to track the number of pending packets under highest SACKed sequence. FACK is subsumed by the time-based RACK loss detection which is more robust under reordering and second order losses.
Yuchung Cheng (2): tcp: retire FACK loss detection tcp: use sequence distance to detect reordering Documentation/networking/ip-sysctl.txt | 3 +- include/linux/tcp.h | 2 - include/net/tcp.h | 14 +-- include/uapi/linux/snmp.h | 1 - net/ipv4/proc.c | 1 - net/ipv4/tcp.c | 3 - net/ipv4/tcp_input.c | 208 ++++++++++++--------------------- net/ipv4/tcp_metrics.c | 4 +- net/ipv4/tcp_minisocks.c | 6 +- net/ipv4/tcp_output.c | 22 +--- 10 files changed, 80 insertions(+), 184 deletions(-) -- 2.15.0.448.gf294e3d99a-goog
