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| author | Yuchung Cheng <ycheng@google.com> | 2017-01-12 22:11:41 -0800 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-01-13 22:37:16 -0500 |
| commit | 4a7f6009441144783e5925551c72e3f2e1b0839b (patch) | |
| tree | 41e521496a3c78abfcabb41f4a20f4f8c535887e /include/linux/tcp.h | |
| parent | ac229dca7e4e582114e1ec9765fda0915aa58468 (diff) | |
| download | linux-rpi-4a7f6009441144783e5925551c72e3f2e1b0839b.tar.gz linux-rpi-4a7f6009441144783e5925551c72e3f2e1b0839b.tar.bz2 linux-rpi-4a7f6009441144783e5925551c72e3f2e1b0839b.zip | |
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/linux/tcp.h')
| -rw-r--r-- | include/linux/tcp.h | 2 |
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; |