diff options
| author |   Neal Cardwell <ncardwell@google.com> | 2016-09-19 23:39:13 -0400 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2016-09-21 00:23:00 -0400 |
| commit | 0682e6902a52aca7caf6ad42551b16ea0f87bc31 (patch) | |
| tree | 659bae32eb96d42f6b39ef8f383fa20cd37a0b0e /include | |
| parent | tcp: switch back to proper tcp_skb_cb size check in tcp_init() (diff) | |
| download | linux-dev-0682e6902a52aca7caf6ad42551b16ea0f87bc31.tar.xz linux-dev-0682e6902a52aca7caf6ad42551b16ea0f87bc31.zip | |
tcp: count packets marked lost for a TCP connection
Count the number of packets that a TCP connection marks lost.
Congestion control modules can use this loss rate information for more
intelligent decisions about how fast to send.
Specifically, this is used in TCP BBR policer detection. BBR uses a
high packet loss rate as one signal in its policer detection and
policer bandwidth estimation algorithm.
The BBR policer detection algorithm cannot simply track retransmits,
because a retransmit can be (and often is) an indicator of packets
lost long, long ago. This is particularly true in a long CA_Loss
period that repairs the initial massive losses when a policer kicks
in.
Signed-off-by: Van Jacobson <vanj@google.com>
Signed-off-by: Neal Cardwell <ncardwell@google.com>
Signed-off-by: Yuchung Cheng <ycheng@google.com>
Signed-off-by: Nandita Dukkipati <nanditad@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/tcp.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/tcp.h b/include/linux/tcp.h index 6433cc8b4667..38590fbc0ac5 100644 --- a/include/linux/tcp.h +++ b/include/linux/tcp.h @@ -267,6 +267,7 @@ struct tcp_sock { * receiver in Recovery. */ u32 prr_out; /* Total number of pkts sent during Recovery. */ u32 delivered; /* Total data packets delivered incl. rexmits */ + u32 lost; /* Total data packets lost incl. rexmits */ u32 rcv_wnd; /* Current receiver window */ u32 write_seq; /* Tail(+1) of data held in tcp send buffer */ |