From 6f130e85c76cfc2c58ba31f90d2ac3800866c1dd Mon Sep 17 00:00:00 2001 From: "Thomas H. P. Andersen" Date: Thu, 31 May 2018 13:30:10 +0200 Subject: [PATCH] sysctl.d: request ECN on both in and outgoing connections (#9143) To further avoid bufferbloat Explicit Congestion Notification (ECN) should be enabled for both in and outgoing connections. The kernel default is to enable it when requested for incoming connections, but not to request it on outgoing connections. This patch enables it for both. A long time ago enabling these was causing problems, but these issues have since been dealt with. Fixes #9087. --- sysctl.d/50-default.conf | 3 +++ 1 file changed, 3 insertions(+) diff --git a/sysctl.d/50-default.conf b/sysctl.d/50-default.conf index e263cf06284..b67ae87ca6b 100644 --- a/sysctl.d/50-default.conf +++ b/sysctl.d/50-default.conf @@ -33,6 +33,9 @@ net.ipv4.conf.all.promote_secondaries = 1 # Fair Queue CoDel packet scheduler to fight bufferbloat net.core.default_qdisc = fq_codel +# Request Explicit Congestion Notification (ECN) on both in and outgoing connections +net.ipv4.tcp_ecn = 1 + # Enable hard and soft link protection fs.protected_hardlinks = 1 fs.protected_symlinks = 1