Struct RingConfig 

pub struct RingConfig {
    pub size: u32,
    pub timeout_wheel_tick: Duration,
}

Configuration of each worker’s io_uring instance and operation timing wheel.

The runtime requires Linux 6.1 or newer and always uses single-issuer mode with deferred task work. The same configuration applies to pool and dedicated workers. The wheel horizon is derived from network timeout policy.

Fields

size: u32

SQ size and maximum outstanding operation SQEs, rounded up to a power of two.

Must be nonzero and round to at most 32,768. Defaults to 128. The runtime chooses 1024 for its production default and 128 when built for tests.

The CQ uses the kernel default of twice the rounded SQ size. Cancellation and mailbox wake CQEs also use that space, and cancellation acknowledgements can outlive their requests. The operation limit therefore does not bound all pending CQEs. The runtime relies on the kernel’s CQ overflow backlog (IORING_FEAT_NODROP), drained by subsequent completion-service enters.

timeout_wheel_tick: Duration

Nonzero operation deadline granularity, defaulting to 5 milliseconds.

Smaller ticks improve precision but increase wheel storage and service frequency. Configuration must fit within 1,048,576 wheel slots.

Trait Implementations

impl Clone for RingConfig

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for RingConfig

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for RingConfig

fn default() -> Self

Returns the “default value” for a type.