Struct UringCfg 

pub struct UringCfg {
    pub coop_taskrun: bool,
    pub defer_taskrun: bool,
    pub iopoll: bool,
    pub sqpoll: Option<u32>,
}

Configuration options for io_uring initialization.

These are advanced options that affect io_uring behavior. Most users should use UringCfg::default(). Incorrect configuration may cause EINVAL errors or degraded performance.

Kernel Requirements

Some options require specific kernel versions or capabilities:

• coop_taskrun: Linux 5.19+
• defer_taskrun: Linux 6.1+
• sqpoll: Requires CAP_SYS_NICE capability
• iopoll: Only works with O_DIRECT files on supported filesystems

Fields

coop_taskrun: bool

Enable cooperative task running (Linux 5.19+). When enabled, the kernel will only process completions when the application explicitly asks for them, reducing overhead.

defer_taskrun: bool

Enable deferred task running (Linux 6.1+). Similar to coop_taskrun but with additional deferral. Requires coop_taskrun to also be set.

iopoll: bool

Enable I/O polling mode. When enabled, the kernel will poll for completions instead of using interrupts. Only works with O_DIRECT files on supported filesystems. Can provide lower latency but uses more CPU.

sqpoll: Option<u32>

Enable submission queue polling with the given idle timeout in milliseconds. When enabled, a kernel thread will poll the submission queue, eliminating the need for system calls to submit I/O. The thread will go to sleep after being idle for the specified duration. Requires CAP_SYS_NICE capability.

Trait Implementations

impl Clone for UringCfg

fn clone(&self) -> UringCfg

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for UringCfg

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

Formats the value using the given formatter.

impl Default for UringCfg

fn default() -> UringCfg

Returns the “default value” for a type.