sysctl.d: Do not set net.ipv4.tcp_ecn

Historically, negotiating ECN for outgoing connections has caused problems. systemd has tried to enable it
in the past [1], but it was quickly reverted due to said problems [2]. Now, we got reports of performance issues
with webservers and VMs [3]. Let's stick to the defaults with this one

[1] systemd/systemd@9194727
[2] systemd/systemd#9880
[3] https://discuss.cachyos.org/t/strange-performance-using-ansible-and-maybe-other-programs/6079

Signed-off-by: Eric Naim <[email protected]>

Author: 1Naim

usr/lib/sysctl.d/99-cachyos-settings.conf

@@ -41,9 +41,6 @@ kernel.kptr_restrict = 2
 # Disable Kexec, which allows replacing the current running kernel.
 kernel.kexec_load_disabled = 1
 
-# TCP Enable ECN Negotiation for both outgoing and incoming connections
-net.ipv4.tcp_ecn = 1
-
 # Increase netdev receive queue
 # May help prevent losing packets
 net.core.netdev_max_backlog = 4096