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authorDaniel Vetter <daniel.vetter@ffwll.ch>2017-03-14 17:07:33 +0300
committerDaniel Vetter <daniel.vetter@ffwll.ch>2017-03-14 17:07:33 +0300
commitb70366e5d31788650b2a5cec5cd13ea80ac7e44a (patch)
treed972ffd190111d699200448494fda333d28b2486 /Documentation/networking/ip-sysctl.txt
parentf42e181935d5e5670c87d31ae48063a495bbacae (diff)
parentdb6ccf23e8ba40fc2e8914ec9c0eb950df71d9fe (diff)
downloadlinux-b70366e5d31788650b2a5cec5cd13ea80ac7e44a.tar.xz
Merge tag 'doc-4.11-images' of git://git.lwn.net/linux into drm-misc-next
Pointer for Markus's image conversion work. We need this so we can merge all the pretty drm graphs for 4.12. Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Diffstat (limited to 'Documentation/networking/ip-sysctl.txt')
-rw-r--r--Documentation/networking/ip-sysctl.txt47
1 files changed, 21 insertions, 26 deletions
diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index 7dd65c9cf707..fc73eeb7b3b8 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -246,21 +246,12 @@ tcp_dsack - BOOLEAN
Allows TCP to send "duplicate" SACKs.
tcp_early_retrans - INTEGER
- Enable Early Retransmit (ER), per RFC 5827. ER lowers the threshold
- for triggering fast retransmit when the amount of outstanding data is
- small and when no previously unsent data can be transmitted (such
- that limited transmit could be used). Also controls the use of
- Tail loss probe (TLP) that converts RTOs occurring due to tail
- losses into fast recovery (draft-dukkipati-tcpm-tcp-loss-probe-01).
+ Tail loss probe (TLP) converts RTOs occurring due to tail
+ losses into fast recovery (draft-ietf-tcpm-rack). Note that
+ TLP requires RACK to function properly (see tcp_recovery below)
Possible values:
- 0 disables ER
- 1 enables ER
- 2 enables ER but delays fast recovery and fast retransmit
- by a fourth of RTT. This mitigates connection falsely
- recovers when network has a small degree of reordering
- (less than 3 packets).
- 3 enables delayed ER and TLP.
- 4 enables TLP only.
+ 0 disables TLP
+ 3 or 4 enables TLP
Default: 3
tcp_ecn - INTEGER
@@ -712,18 +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
@@ -742,6 +721,13 @@ tcp_challenge_ack_limit - INTEGER
UDP variables:
+udp_l3mdev_accept - BOOLEAN
+ Enabling this option allows a "global" bound socket to work
+ across L3 master domains (e.g., VRFs) with packets capable of
+ being received regardless of the L3 domain in which they
+ originated. Only valid when the kernel was compiled with
+ CONFIG_NET_L3_MASTER_DEV.
+
udp_mem - vector of 3 INTEGERs: min, pressure, max
Number of pages allowed for queueing by all UDP sockets.
@@ -843,6 +829,15 @@ ip_local_reserved_ports - list of comma separated ranges
Default: Empty
+ip_unprivileged_port_start - INTEGER
+ This is a per-namespace sysctl. It defines the first
+ unprivileged port in the network namespace. Privileged ports
+ require root or CAP_NET_BIND_SERVICE in order to bind to them.
+ To disable all privileged ports, set this to 0. It may not
+ overlap with the ip_local_reserved_ports range.
+
+ Default: 1024
+
ip_nonlocal_bind - BOOLEAN
If set, allows processes to bind() to non-local IP addresses,
which can be quite useful - but may break some applications.