From: Sami Kerola <kerolasa@iki.fi>
Instead of saying 'consult your technical export' the
documentation needs to assist an export to decide whether to keep
these settings off or set them on.
Signed-off-by: Sami Kerola <kerolasa@iki.fi>
---
Documentation/networking/ip-sysctl.txt | 20 +++++++++++++-------
1 files changed, 13 insertions(+), 7 deletions(-)
diff --git a/Documentation/networking/ip-sysctl.txt b/Documentation/networking/ip-sysctl.txt
index f350c69..01e2948 100644
--- a/Documentation/networking/ip-sysctl.txt
+++ b/Documentation/networking/ip-sysctl.txt
@@ -444,15 +444,21 @@ tcp_tso_win_divisor - INTEGER
Default: 3
tcp_tw_recycle - BOOLEAN
- Enable fast recycling TIME-WAIT sockets. Default value is 0.
- It should not be changed without advice/request of technical
- experts.
+ Enable fast recycling TIME-WAIT sockets. See also caution
+ wrote to tcp_tw_reuse. Default value is 0.
tcp_tw_reuse - BOOLEAN
- Allow to reuse TIME-WAIT sockets for new connections when it is
- safe from protocol viewpoint. Default value is 0.
- It should not be changed without advice/request of technical
- experts.
+ Allow to reuse TIME-WAIT sockets for new connections when it is safe
+ from protocol viewpoint. One should enable also tcp_timestamps when
+ this is enabled. Default value is 0.
+
+ Caution. Both tcp_tw_recycle and tcp_tw_reuse can cause problems. You
+ should not enable either without being sure about network topology in
+ between node(s) which are using, or used by, the node(s) where the
+ parameter is enabled. Connections that go via TCP state aware nodes,
+ such as firewalls, NAT devices or load balancers may start drop frames
+ because of the setting. The more there are connections the greater is
+ the likelyhood you will see this issue.
tcp_window_scaling - BOOLEAN
Enable window scaling as defined in RFC1323.
--
1.7.3.1
--
