| Message ID | 20200624164203.183122-1-ncardwell@google.com |
|---|---|
| Headers | show |
| Series | tcp_cubic: fix spurious HYSTART_DELAY on RTT decrease | expand |
From: Neal Cardwell <ncardwell@google.com> Date: Wed, 24 Jun 2020 12:42:01 -0400 > This series fixes a long-standing bug in the TCP CUBIC > HYSTART_DELAY mechanim recently reported by Mirja Kuehlewind. The > code can cause a spurious exit of slow start in some particular > cases: upon an RTT decrease that happens on the 9th or later ACK > in a round trip. This series fixes the original Hystart code and > also the recent BPF implementation. Series applied and queued up for -stable, thank you.
This series fixes a long-standing bug in the TCP CUBIC HYSTART_DELAY mechanim recently reported by Mirja Kuehlewind. The code can cause a spurious exit of slow start in some particular cases: upon an RTT decrease that happens on the 9th or later ACK in a round trip. This series fixes the original Hystart code and also the recent BPF implementation. Neal Cardwell (2): tcp_cubic: fix spurious HYSTART_DELAY exit upon drop in min RTT bpf: tcp: bpf_cubic: fix spurious HYSTART_DELAY exit upon drop in min RTT net/ipv4/tcp_cubic.c | 5 ++--- tools/testing/selftests/bpf/progs/bpf_cubic.c | 5 ++--- 2 files changed, 4 insertions(+), 6 deletions(-)