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Apache 2.0 License Go Reference Go Report Card codecov


Gain is a high-performance io_uring networking framework written entirely in Go.

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Table of Contents
  1. About The Project
  2. Getting Started
  3. Usage
  4. Roadmap
  5. Performance
  6. Contributing
  7. License
  8. Contact
  9. Relevant Articles

About The Project

Gain is a high-performance networking framework written entirely in Go. It uses io_uring - a new asynchronous I/O API for Linux created by Jens Axboe from Facebook. Currently only Linux is supported.

WARNING: This is an alpha version so it is not yet stable enough to use in a production environment.

Articles about the project:

Getting Started

See examples:


Gain requires Go 1.19+


  1. Install the framework
    go get -u

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  • Go liburing port
  • Reactor architecture
  • Socket sharding architecture
  • Async workers and workers pool
  • Lock-free
  • Protocols
    • TCP
    • UDP
    • Unix Domain Socket
  • Load balancing
    • Round robin
    • Least connection
    • Source IP hash
    • Support for custom implementations
  • Support for read and write deadlines
  • Further io_uring optimizations
  • More flexible connection buffer
  • Documentation
  • Support for kernels older than 5.15
  • Support for Windows - IoRing (documentation)

See the open issues for a full list of proposed features (and known issues).

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AWS EC2 instance: m6i.xlarge
vCPU: 4
OS: Ubuntu 22.04 LTS
Kernel: 5.15.0-1026-aws
Go: go1.19.3 linux/amd64
Number of connections: 512
Benchmark type: see TechEmpower Plaintext


Perfect locality

Run this script on the server machine before starting Gain. The first parameter is the name of network interface (e.g. eth0, ens5).


systemctl stop irqbalance.service

export IRQS=($(grep $1 /proc/interrupts | awk '{print $1}' | tr -d :))
for i in ${!IRQS[@]}; do echo $i > /proc/irq/${IRQS[i]}/smp_affinity_list; done;

export TXQUEUES=($(ls -1qdv /sys/class/net/$1/queues/tx-*))
for i in ${!TXQUEUES[@]}; do printf '%x' $((2**i)) > ${TXQUEUES[i]}/xps_cpus; done;

To understand how it was achieved read an excellent article: Extreme HTTP Performance Tuning

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Contributions are what make the open source community such an amazing place to learn, inspire, and create. Any contributions you make are greatly appreciated.

If you have a suggestion that would make this better, please fork the repo and create a pull request. You can also simply open an issue with the tag "enhancement". Don't forget to give the project a star! Thanks again!

  1. Fork the Project
  2. Create your Feature Branch (git checkout -b feature/AmazingFeature)
  3. Commit your Changes (git commit -m 'Add some AmazingFeature')
  4. Push to the Branch (git push origin feature/AmazingFeature)
  5. Open a Pull Request

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Distributed under the Apache 2.0 License. See LICENSE for more information.

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Paweł Gaczyński - LinkedIn

Project Link:

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Relevant Articles

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Gain is a high-performance io_uring networking framework written entirely in Go.







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