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io_uring moves I/O requests and results through two ring buffers shared by an application and the Linux kernel: the application puts requests into the submission queue (SQ), and the kernel puts results into the completion queue (CQ). The queues run in opposite directions, and an application must track which completion belongs to which request.
What the two queues do
io_uring is a Linux-specific asynchronous I/O interface. Its shared rings provide a place for the application and kernel to exchange work without treating each request as a separate message.
| Queue | Direction | What moves through it | Who adds entries |
|---|---|---|---|
| Submission queue (SQ) | Application to kernel | Submission queue entries (SQEs) describing operations such as reads, writes, or socket accepts | The application adds SQEs; the kernel consumes them |
| Completion queue (CQ) | Kernel to application | Completion queue events (CQEs) reporting operation results | The kernel adds CQEs; the application consumes them |
A CQE’s res field contains the operation result. Its user_data field can carry an identifier the application supplied with the SQE, which helps match a completion to its request. Linux Programmer’s Manual: io_uring(7)
How a request travels through io_uring
- Prepare an SQE. Describe the operation the application wants the kernel to perform.
- Publish it to the SQ. The application places the entry at the queue’s tail; the kernel consumes entries from the head.
- Notify the kernel. The application normally uses
io_uring_enter(2)to submit queued work. Depending on how it is called, this system call can also wait for a requested number of completions. - Read a CQE. When the operation completes, the kernel posts a CQE to the CQ. The application reads it and checks the result and any request identifier.
Because requests can be batched, an application can place multiple SQEs in the ring before notifying the kernel. The shared-ring model does not mean every operation avoids system calls in every configuration. The Linux manual describes the request and completion model in io_uring(7).
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Why queue order is not completion order
The kernel attempts requests in submission order, but that does not guarantee the order in which they execute or complete. If several requests are in flight, a later submission might complete before an earlier one. Use an identifier such as user_data to associate each CQE with the request it reports; do not infer that relationship from position alone.
When one operation depends on another, use the API’s documented ordering mechanisms and account for the constraints of those particular operations. The two queues describe how requests and results are exchanged; they are not, by themselves, a guarantee of ordering among operations.
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Buffer lifetime and synchronization matter
Keep I/O buffers alive
Buffers used by operations such as IORING_OP_READ and IORING_OP_WRITE must remain valid until the operation completes. Do not reuse or free an in-flight buffer just because its SQE has been submitted. Other pointed-to metadata can have different consumption rules, so check the documentation for the specific operation rather than assuming all memory can be released at the same point.
Follow the ring’s memory-ordering rules
The rings are shared memory, not automatically synchronized memory. Code that directly manipulates them must publish and consume queue indices using the required ordering rules. The manual points to Linux memory-barrier and C11/kernel memory-model documentation; consult those rules when implementing ring access yourself. io_uring(7)
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Setup determines the ring layout
Applications commonly create a ring with io_uring_setup(2) and map its regions into user space with mmap(2). Setup returns parameters describing entry counts, offsets, and supported features. Use those returned values to map and operate the rings rather than assuming a fixed layout. Linux Programmer’s Manual: io_uring_setup(2)
Some layout options depend on kernel version. The setup manual lists IORING_FEAT_SINGLE_MMAP from Linux 5.4; it allows the SQ and CQ rings to share a mapping, while SQEs remain separately allocated. It lists IORING_SETUP_NO_MMAP from Linux 6.5 and IORING_SETUP_NO_SQARRAY from Linux 6.6. These are compatibility facts, not options to assume on every system: inspect the runtime setup result and handle unsupported features or setup errors.
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What the two-queue model tells you—and what it does not
- It tells you the direction of exchange: SQEs carry requests toward the kernel, and CQEs carry results back.
- It explains the shared-memory design: both parties interact with ring buffers established during setup.
- It does not guarantee completion order: correlate results with requests rather than relying on queue position.
- It does not remove application responsibilities: keep in-flight buffers valid and follow the synchronization rules.
- It does not prove a performance advantage by itself: performance depends on workload and configuration; the cited manual pages do not establish blanket superiority over other I/O approaches.
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