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What cgroups do on a shared game server
Linux control groups, or cgroups, organize processes in a hierarchy. Enabled controllers can measure resource use and influence how resources are distributed among groups. A host’s cgroup version, controller availability and hierarchy determine which controls are actually usable; a controller that is absent, disabled or attached to a different hierarchy cannot be assumed to work. See the Linux kernel’s cgroup v2 documentation.
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This is resource management, not a guarantee that one server’s players will never feel another workload. A control can limit or prioritize certain resource use, but user-visible latency also depends on host scheduling, the storage device, the workload and other bottlenecks.
CPU: relative share is not a dedicated core
In cgroup v2, cpu.weight sets a relative CPU allocation for supported scheduler classes when groups compete for CPU. It is a proportioning control, not a promise that a server will always receive a particular amount of processing time. By contrast, cpu.max sets a bandwidth ceiling for eligible fair-class processes (or supported BPF schedulers). Neither setting pins a process to a CPU or reserves exclusive hardware; CPU placement is a separate concern.
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A bandwidth cap can protect co-tenants from a server using too much CPU, but a group that reaches its quota can be throttled until its allowance is replenished. That may contribute to stalls, rather than eliminate them. To check whether the group is hitting its own limit, inspect its cpu.stat file: it reports usage such as usage_usec and, when the controller is enabled, throttling counters including nr_throttled and throttled_usec. Those counters are evidence of throttling, not proof that it is the sole cause of observed latency; host scheduling and other constraints still matter.
Memory: pressure first, or a hard limit
Memory controls have different failure behavior. memory.low is a best-effort protection boundary; memory.min provides hard protection up to its effective boundary. memory.high applies reclaim pressure and throttles a group that goes above the boundary, but does not itself invoke OOM. memory.max is the principal hard usage limit: if reclaim cannot bring usage down, the cgroup’s OOM killer can terminate a process in that group.
These controls can keep one game server from consuming memory needed by co-tenants or the host. The tradeoff is that the limited server may reclaim memory, stall or fail under pressure. A cap is therefore a boundary on resource use, not a promise of uninterrupted service.
Storage I/O: a device limit, not a latency guarantee
When the I/O controller is available and configured, cgroup v2’s io.max can cap maximum bytes per second (BPS), operations per second (IOPS), or both for a specified device. This controls device I/O through that controller. It does not guarantee storage latency, prevent every effect of device contention or shape network traffic. The documentation covered here does not establish cgroup network-bandwidth control or an end-to-end guarantee against storage contention.
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Tasks, networking and security boundaries
Cgroups can also account for and control task counts when the relevant controller is enabled. But resource grouping should not be mistaken for process or security isolation: cgroups alone do not provide a complete boundary for what processes can see or access. Hosts need appropriate complementary mechanisms, such as namespaces and access controls, for those boundaries. Nor should a cgroup CPU or I/O setting be treated as a general control over network contention.
How systemd affects configuration
On a systemd-managed host, systemd manages the cgroup tree and provides resource controls for service, slice and scope units. Its settings include controls such as CPUWeight= and TasksMax=; systemd enables relevant controllers as needed, subject to the hierarchy and available controllers. Check the installed systemd version and the actual unit configuration before relying on a setting.
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Services that need to create and manage child cgroups require delegation. The systemd project states: “Services must set Delegate=yes for the units they intend to manage subcgroups of.” Use systemd’s unit controls or a correctly delegated subtree rather than manipulating systemd-owned cgroups directly. See The New Control Group Interfaces and the systemd resource-control manual.
What to check when a server is struggling
- Confirm the control environment. Establish whether the host uses cgroup v2, which controllers are available and enabled, and which cgroup contains the game-server processes. A setting cannot govern a resource through a controller the hierarchy does not expose.
- Inspect the service manager’s configuration. On systemd hosts, review the unit and applicable slice settings, including resource controls and any delegation needed for child groups. Verify the installed systemd version rather than assuming a setting or behavior is universal.
- Look for matching resource evidence. For CPU, compare usage and throttling counters in
cpu.stat. For memory, examine usage, pressure and memory events alongside the configured boundaries. For I/O, confirm the device and limits actually configured. A limit’s presence alone does not show that it caused a particular symptom. - Measure the host and workload together. Tick-time or latency effects require workload-specific observation alongside host scheduling, memory and device conditions. Cgroup accounting can help identify constraints; it does not attribute every delay or prove a user-visible performance outcome by itself.
Choose controls for the failure behavior you can accept
| Control | What it does | Important tradeoff or boundary |
|---|---|---|
cpu.weight |
Sets relative CPU allocation under contention for supported scheduler classes. | Does not reserve a core or ensure a fixed share when the host is not contended. |
cpu.max |
Sets a CPU bandwidth ceiling for eligible processes. | Can throttle the capped group when it reaches its allowance; it is not CPU placement. |
memory.low / memory.min |
Provide best-effort / hard memory protection, respectively, up to the applicable boundary. | Protection depends on the effective hierarchy and does not create additional host memory. |
memory.high |
Applies reclaim pressure and throttling above the boundary. | Can slow the group; it does not invoke OOM by itself. |
memory.max |
Sets the principal hard memory usage limit. | If reclaim fails, the cgroup OOM killer can terminate a process in the group. |
io.max |
Caps BPS and/or IOPS for a configured device when the I/O controller is available. | Does not govern network bandwidth or guarantee storage latency. |
| Namespaces and access controls | Complement resource controls with process-visibility and security boundaries. | Cgroups alone do not provide a complete isolation boundary. |
There is no universally safe CPU or memory value for a game server: appropriate limits depend on host capacity, kernel and systemd configuration, the game workload and co-tenant behavior. A resource limit may protect the rest of the host while making the capped server less responsive or, for a hard memory cap, causing it to fail.
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