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Ryan Huber
73d26dd87d
Set tun.avoid_cpus to a list of logical CPUs to remove from the affinity of every thread of the process on Linux, before services start and reader CPUs are chosen. Later threads inherit the restricted mask; enumeration repeats so threads created meanwhile are covered. Inherited taskset and cgroup restrictions are kept. Keeping Nebula off the underlay NIC's receive IRQ CPUs and their SMT siblings is what this is for; the example configuration shows how to find them. Invalid IDs, a list that would leave a thread no CPU, and syscall failures fail startup. Configuration tests only validate. Other platforms log and ignore the setting. The exclusion is process-wide, including embedded use, and not reloadable. It is independent of thread pinning. New API: util.AvoidCPUs, next to the existing PinThreadToCPU and AllowedCPUs. Tests run in a child process and check existing and new threads, preserved inherited masks, validation without changes, and the unix.CPUSet bounds on 32- and 64-bit platforms. No isolated performance claim is made.
9 lines
235 B
Go
9 lines
235 B
Go
//go:build !linux || android || e2e_testing
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package util
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import "errors"
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// AvoidCPUs is unsupported outside Linux: there is no thread affinity API to restrict.
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func AvoidCPUs(_ []int, _ bool) error { return errors.ErrUnsupported }
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