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feat(deploy): extend sysctls with udp_*_min, fq_codel default, BBR

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Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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mwiegand 2026-05-10 00:28:24 +02:00
parent e1add4fffa
commit e822e9fbc7
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2 changed files with 19 additions and 0 deletions
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15
deploy/files/etc/sysctl.d/99-left4me.conf
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@ -19,3 +19,18 @@ net.core.netdev_budget = 600
# Latency-sensitive default: avoid swap unless the box is really under # Latency-sensitive default: avoid swap unless the box is really under
# pressure. Harmless on swapless hosts. # pressure. Harmless on swapless hosts.
vm.swappiness = 10 vm.swappiness = 10
# Per-socket UDP buffer floors: protect game-server sockets that don't bump
# their own SO_RCVBUF/SO_SNDBUF when softirq drains lag briefly.
net.ipv4.udp_rmem_min = 16384
net.ipv4.udp_wmem_min = 16384
# Default qdisc for ifaces we don't explicitly shape with CAKE. Debian Trixie
# already defaults to fq_codel; setting it explicitly is belt-and-suspenders
# and survives kernel-default churn.
net.core.default_qdisc = fq_codel
# TCP congestion control: BBR for any bulk TCP egress on the host (admin SSH,
# backups, package fetches, web-app responses) so a long flow does not push
# the bottleneck queue ahead of game UDP. UDP srcds is unaffected.
net.ipv4.tcp_congestion_control = bbr

4
deploy/tests/test_deploy_artifacts.py
View file

@ -207,6 +207,10 @@ def test_sysctl_conf_present_with_perf_settings():
"net.core.netdev_max_backlog = 5000", "net.core.netdev_max_backlog = 5000",
"net.core.netdev_budget = 600", "net.core.netdev_budget = 600",
"vm.swappiness = 10", "vm.swappiness = 10",
"net.ipv4.udp_rmem_min = 16384",
"net.ipv4.udp_wmem_min = 16384",
"net.core.default_qdisc = fq_codel",
"net.ipv4.tcp_congestion_control = bbr",
): ):
assert line in text, f"missing {line!r} in 99-left4me.conf" assert line in text, f"missing {line!r} in 99-left4me.conf"