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| author | Michael Weiss <dev.primeos@gmail.com> | 2020-02-23 18:45:29 +0100 |
|---|---|---|
| committer | Michael Weiss <dev.primeos@gmail.com> | 2020-03-02 10:57:47 +0100 |
| commit | 60f4345e37d6b4c02ab8ca8fa104ae8a32ccf856 (patch) | |
| tree | c2e30a74ba260a0622b3bf82b07de46dbfffd90d /pkgs/os-specific/linux/kernel/common-config.nix | |
| parent | c3c47544e06cc028f1a9b590e7e16edddce8b2ee (diff) | |
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linux config: Set TCP_CONG_CUBIC=yes to restore the default
This will switch the default TCP congestion control algorithm from new Reno to CUBIC. CUBIC is the default since Linux kernel 2.6.19 (see 597811ec167fa) and most (all?) distributions keep this default (e.g. Debian and Ubuntu). On NixOS the default was still new Reno because generate-config.pl changes TCP_CONG_CUBIC from y to m (since we try to build everything as a module by default). To check the active and available algorithms: $ sysctl net.ipv4.tcp_congestion_control net.ipv4.tcp_congestion_control = cubic $ sysctl net.ipv4.tcp_available_congestion_control net.ipv4.tcp_available_congestion_control = cubic reno Note: E.g. x86_64_defconfig sets TCP_CONG_CUBIC=y indirectly via CONFIG_TCP_CONG_ADVANCED=y (but CUBIC is also the default if set to no, see net/ipv4/Kconfig).
Diffstat (limited to 'pkgs/os-specific/linux/kernel/common-config.nix')
| -rw-r--r-- | pkgs/os-specific/linux/kernel/common-config.nix | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/pkgs/os-specific/linux/kernel/common-config.nix b/pkgs/os-specific/linux/kernel/common-config.nix index f9579a9fde5..dbac890dfd1 100644 --- a/pkgs/os-specific/linux/kernel/common-config.nix +++ b/pkgs/os-specific/linux/kernel/common-config.nix @@ -120,6 +120,7 @@ let XDP_SOCKETS = whenAtLeast "4.19" yes; XDP_SOCKETS_DIAG = whenAtLeast "4.19" yes; WAN = yes; + TCP_CONG_CUBIC = yes; # This is the default congestion control algorithm since 2.6.19 # Required by systemd per-cgroup firewalling CGROUP_BPF = option yes; CGROUP_NET_PRIO = yes; # Required by systemd |