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alanshaw/sysctl-tweaks.md

Created May 8, 2020 10:13
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Notes on network debugging
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sysctl-tweaks.md

https://access.redhat.com/solutions/30453

dmesg -wH
sysctl net.netfilter.nf_conntrack_max
net.netfilter.nf_conntrack_max = 196608

sysctl net.core.somaxconn
net.core.somaxconn 128

sysctl net.ipv4.tcp_max_syn_backlog
net.ipv4.tcp_max_syn_backlog 512

sysctl net.core.netdev_max_backlog
net.core.netdev_max_backlog 1000

# Up the limits
# see https://wiki.mikejung.biz/Sysctl_tweaks
sysctl -w net.netfilter.nf_conntrack_max=500000
sysctl -w net.ipv4.tcp_max_syn_backlog=131072
sysctl -w net.core.somaxconn=131072
sysctl -w net.core.netdev_max_backlog=5000
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