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authorYuchung Cheng <ycheng@google.com>2017-01-12 22:11:41 -0800
committerDavid S. Miller <davem@davemloft.net>2017-01-13 22:37:16 -0500
commit4a7f6009441144783e5925551c72e3f2e1b0839b (patch)
tree41e521496a3c78abfcabb41f4a20f4f8c535887e /include
parentac229dca7e4e582114e1ec9765fda0915aa58468 (diff)
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 'include')
-rw-r--r--include/linux/tcp.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index 4733368f953a..6c22332afb75 100644
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h
@@ -220,7 +220,7 @@ struct tcp_sock {
unused:5;
u8 nonagle : 4,/* Disable Nagle algorithm? */
thin_lto : 1,/* Use linear timeouts for thin streams */
- thin_dupack : 1,/* Fast retransmit on first dupack */
+ unused1 : 1,
repair : 1,
frto : 1;/* F-RTO (RFC5682) activated in CA_Loss */
u8 repair_queue;