[media] tda18212: silence compiler warning

[karo-tx-linux.git] / Documentation / networking / ip-sysctl.txt

diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index 6f896b94abdc74369a28eb48f8af74bfe2c0c84a..ca447b35b8333106cdd19649d943d80cdb12cc1e 100644 (file)
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -48,12 +48,6 @@ min_adv_mss - INTEGER
        The advertised MSS depends on the first hop route MTU, but will
        never be lower than this setting.
 
-rt_cache_rebuild_count - INTEGER
-       The per net-namespace route cache emergency rebuild threshold.
-       Any net-namespace having its route cache rebuilt due to
-       a hash bucket chain being too long more than this many times
-       will have its route caching disabled
-
 IP Fragmentation:
 
 ipfrag_high_thresh - INTEGER
@@ -468,6 +462,19 @@ tcp_syncookies - BOOLEAN
        SYN flood warnings in logs not being really flooded, your server
        is seriously misconfigured.
 
+tcp_fastopen - INTEGER
+       Enable TCP Fast Open feature (draft-ietf-tcpm-fastopen) to send data
+       in the opening SYN packet. To use this feature, the client application
+       must not use connect(). Instead, it should use sendmsg() or sendto()
+       with MSG_FASTOPEN flag which performs a TCP handshake automatically.
+
+       The values (bitmap) are:
+       1: Enables sending data in the opening SYN on the client
+       5: Enables sending data in the opening SYN on the client regardless
+          of cookie availability.
+
+       Default: 0
+
 tcp_syn_retries - INTEGER
        Number of times initial SYNs for an active TCP connection attempt
        will be retransmitted. Should not be higher than 255. Default value
@@ -551,6 +558,25 @@ tcp_thin_dupack - BOOLEAN
        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
+       gets losses notifications. With SNDBUF autotuning, this can
+       result in a large amount of packets queued in qdisc/device
+       on the local machine, hurting latency of other flows, for
+       typical pfifo_fast qdiscs.
+       tcp_limit_output_bytes limits the number of bytes on qdisc
+       or device to reduce artificial RTT/cwnd and reduce bufferbloat.
+       Note: For GSO/TSO enabled flows, we try to have at least two
+       packets in flight. Reducing tcp_limit_output_bytes might also
+       reduce the size of individual GSO packet (64KB being the max)
+       Default: 131072
+
+tcp_challenge_ack_limit - INTEGER
+       Limits number of Challenge ACK sent per second, as recommended
+       in RFC 5961 (Improving TCP's Robustness to Blind In-Window Attacks)
+       Default: 100
+
 UDP variables:
 
 udp_mem - vector of 3 INTEGERs: min, pressure, max
@@ -857,9 +883,19 @@ accept_source_route - BOOLEAN
                FALSE (host)
 
 accept_local - BOOLEAN
-       Accept packets with local source addresses. In combination with
-       suitable routing, this can be used to direct packets between two
-       local interfaces over the wire and have them accepted properly.
+       Accept packets with local source addresses. In combination
+       with suitable routing, this can be used to direct packets
+       between two local interfaces over the wire and have them
+       accepted properly.
+
+       rp_filter must be set to a non-zero value in order for
+       accept_local to have an effect.
+
+       default FALSE
+
+route_localnet - BOOLEAN
+       Do not consider loopback addresses as martian source or destination
+       while routing. This enables the use of 127/8 for local routing purposes.
        default FALSE
 
 rp_filter - INTEGER
@@ -1398,6 +1434,20 @@ path_max_retrans - INTEGER
 
        Default: 5
 
+pf_retrans - INTEGER
+       The number of retransmissions that will be attempted on a given path
+       before traffic is redirected to an alternate transport (should one
+       exist).  Note this is distinct from path_max_retrans, as a path that
+       passes the pf_retrans threshold can still be used.  Its only
+       deprioritized when a transmission path is selected by the stack.  This
+       setting is primarily used to enable fast failover mechanisms without
+       having to reduce path_max_retrans to a very low value.  See:
+       http://www.ietf.org/id/draft-nishida-tsvwg-sctp-failover-05.txt
+       for details.  Note also that a value of pf_retrans > path_max_retrans
+       disables this feature
+
+       Default: 0
+
 rto_initial - INTEGER
        The initial round trip timeout value in milliseconds that will be used
        in calculating round trip times.  This is the initial time interval