[net,2/3] tcp_bbr: reset full pipe detection on loss recovery undo

Message ID 20171207174332.17689-3-ncardwell@google.com
State Accepted
Delegated to: David Miller
Headers show
  • TCP BBR sampling fixes for loss recovery undo
Related show

Commit Message

Neal Cardwell Dec. 7, 2017, 5:43 p.m.
Fix BBR so that upon notification of a loss recovery undo BBR resets
the full pipe detection (STARTUP exit) state machine.

Under high reordering, reordering events can be interpreted as loss.
If the reordering and spurious loss estimates are high enough, this
could previously cause BBR to spuriously estimate that the pipe is

Since spurious loss recovery means that our overall sending will have
slowed down spuriously, this commit gives a flow more time to probe
robustly for bandwidth and decide the pipe is really full.

Signed-off-by: Neal Cardwell <ncardwell@google.com>
Reviewed-by: Yuchung Cheng <ycheng@google.com>
Acked-by: Soheil Hassas Yeganeh <soheil@google.com>
 net/ipv4/tcp_bbr.c | 4 ++++
 1 file changed, 4 insertions(+)


diff --git a/net/ipv4/tcp_bbr.c b/net/ipv4/tcp_bbr.c
index 3089c956b9f9..ab3ff14ea7f7 100644
--- a/net/ipv4/tcp_bbr.c
+++ b/net/ipv4/tcp_bbr.c
@@ -874,6 +874,10 @@  static u32 bbr_sndbuf_expand(struct sock *sk)
 static u32 bbr_undo_cwnd(struct sock *sk)
+	struct bbr *bbr = inet_csk_ca(sk);
+	bbr->full_bw = 0;   /* spurious slow-down; reset full pipe detection */
+	bbr->full_bw_cnt = 0;
 	return tcp_sk(sk)->snd_cwnd;