Io_uring, kTLS and Rust for zero syscall HTTPS server (blog.habets.se)

Article summary

The article discusses the development of a zero-syscall HTTPS server using io_uring, kTLS, and Rust. The author explains how io_uring allows for asynchronous I/O operations without the need for syscalls, and how kTLS enables the kernel to handle encryption and decryption. The author also mentions the challenges of using io_uring with Rust and the need for a safer interface. A web server called tarweb was built to demonstrate these technologies.

Main themes

• io_uring
• kTLS
• Rust programming
• zero-syscall HTTPS server
• asynchronous I/O
• system performance optimization

What commenters say

• The use of io_uring and kTLS can significantly improve the performance of HTTPS servers by reducing the number of syscalls and offloading encryption and decryption to the kernel.
• The current interface for io_uring in Rust is not safe and can lead to errors, and a safer interface is needed to prevent common pitfalls.
• Forking is not always a bad idea, and in some cases, it can be a legitimate technique for application logic, especially when used with care and proper synchronization.
• The benefits of sendfile and kTLS may be marginal in some cases, and their usefulness depends on the specific workload and system configuration.
• Building a safe and efficient interface for io_uring in Rust is a challenging task, and different approaches, such as using ring-owned buffers or exclusive references, have been proposed.
• The use of io_uring and kTLS requires careful consideration of memory management and ownership to ensure safety and prevent errors.
• Some commenters are skeptical about the benefits of io_uring and kTLS, and argue that their advantages may be limited to specific use cases or workloads.
• The development of a safer and more efficient interface for io_uring in Rust is an active area of research and discussion, with different solutions and trade-offs being explored.