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Merge pull request #67768 from peti/t/redis

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nixos/redis: disable transparent huge pages (TLP) before starting Redis
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Peter Simons 2019-09-01 08:49:25 +02:00 committed by GitHub
commit 0808f5ad1d
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1 changed files with 16 additions and 1 deletions
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17
nixos/modules/services/databases/redis.nix
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@ -40,7 +40,12 @@ in
enable = mkOption {
type = types.bool;
default = false;
description = "Whether to enable the Redis server.";
description = ''
Whether to enable the Redis server. Note that the NixOS module for
Redis disables kernel support for Transparent Huge Pages (THP),
because this features causes major performance problems for Redis,
e.g. (https://redis.io/topics/latency).
'';
};
package = mkOption {
@ -224,6 +229,16 @@ in
environment.systemPackages = [ cfg.package ];
systemd.services.disable-transparent-huge-pages = {
enable = config.services.redis.enable;
description = "Disable Transparent Huge Pages (required by Redis)";
after = [ "sysinit.target" "local-fs.target" ];
before = [ "redis.service" ];
wantedBy = [ "redis.service" ];
script = "echo never >/sys/kernel/mm/transparent_hugepage/enabled";
serviceConfig.Type = "oneshot";
};
systemd.services.redis =
{ description = "Redis Server";