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authorYuchung Cheng <ycheng@google.com>2017-01-13 09:11:41 +0300
committerDavid S. Miller <davem@davemloft.net>2017-01-14 06:37:16 +0300
commit4a7f6009441144783e5925551c72e3f2e1b0839b (patch)
tree41e521496a3c78abfcabb41f4a20f4f8c535887e /Documentation/networking
parentac229dca7e4e582114e1ec9765fda0915aa58468 (diff)
downloadlinux-4a7f6009441144783e5925551c72e3f2e1b0839b.tar.xz
tcp: remove thin_dupack feature
Thin stream DUPACK is to start fast recovery on only one DUPACK provided the connection is a thin stream (i.e., low inflight). But this older feature is now subsumed with RACK. If a connection receives only a single DUPACK, RACK would arm a reordering timer and soon starts fast recovery instead of timeout if no further ACKs are received. The socket option (THIN_DUPACK) is kept as a nop for compatibility. Note that this patch does not change another thin-stream feature which enables linear RTO. Although it might be good to generalize that in the future (i.e., linear RTO for the first say 3 retries). Signed-off-by: Yuchung Cheng <ycheng@google.com> Signed-off-by: Neal Cardwell <ncardwell@google.com> Acked-by: Eric Dumazet <edumazet@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation/networking')
-rw-r--r--Documentation/networking/ip-sysctl.txt12
1 files changed, 0 insertions, 12 deletions
diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index 7de2cf79e16f..aa1bb49f1dc6 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -703,18 +703,6 @@ tcp_thin_linear_timeouts - BOOLEAN
Documentation/networking/tcp-thin.txt
Default: 0
-tcp_thin_dupack - BOOLEAN
- Enable dynamic triggering of retransmissions after one dupACK
- for thin streams. If set, a check is performed upon reception
- of a dupACK to determine if the stream is thin (less than 4
- packets in flight). As long as the stream is found to be thin,
- data is retransmitted on the first received dupACK. This
- improves retransmission latency for non-aggressive thin
- streams, often found to be time-dependent.
- For more information on thin streams, see
- Documentation/networking/tcp-thin.txt
- Default: 0
-
tcp_limit_output_bytes - INTEGER
Controls TCP Small Queue limit per tcp socket.
TCP bulk sender tends to increase packets in flight until it