Osiris
Disclaimer
This is a ongoing project.
Benchmarking results are not out yet.
This project uses latest master of https://github.com/axboe/liburing/commits/master
as of Feb 13, 2021, commits 5671af3
YOU NEED TO BE ON LINUX KERNEL 5.11 OR LATER.
io_uring benchmarking
This repository contains:
- epoll server with Level and Edge trigger modes
- io_uring server with interrupt, poll and kernel polling modes
- benchmarking results (faio)
io_uring additionnal informations
- Kernel polling mode will only cost 2 context switches for the server (and additionnal context switches to wake up the kernel thread)
- Kernel polling mode only works with "registered file descriptor" unless you use the IORING_FEAT_SQPOLL_NONFIXED
- Interrupt and polling modes can use the flag IORING_FEAT_FAST_POLL to gain more performance (https://github.com/axboe/liburing/blob/master/man/io_uring_setup.2#L255)
- This io_uring server uses automatic buffer selection (https://lwn.net/Articles/815491/)
- IORING_FEAT_SINGLE_MMAP enable the SQ and CQ rings to be mapped in one mmap call, the SQEs must still be allocated separately. This brings the necessary mmap calls down from 3 to 2.
TODO
- Test w/ io_uring kernel polling mode without IORING_FEAT_SQPOLL_NONFIXED
- Test w/ io_uring without automatic buffer selection
Authors
Amandine Nassiri amandine.nassiri@epita.fr
https://github.com/AnSpake/osiris