action.yml

name: Tune GitHub-hosted runner network
description: OS-neutral interface to disable TCP/UDP offload to fix flaky networking on GitHub-hosted runners
author: Sora Morimoto
branding:
  icon: wifi
  color: gray-dark
runs:
  using: composite
  steps:
    - name: Tune Linux Network
      if: ${{ runner.os == 'Linux' }}
      shell: bash
      run: sudo ethtool -K eth0 tx off rx off

    - name: Tune Windows Network
      if: ${{ runner.os == 'Windows' }}
      shell: pwsh
      run: Disable-NetAdapterChecksumOffload -Name * -TcpIPv4 -UdpIPv4 -TcpIPv6 -UdpIPv6

    - name: Tune macOS Network
      if: ${{ runner.os == 'macOS' }}
      shell: bash
      run: |
        sudo sysctl -w net.link.generic.system.hwcksum_tx=0
        sudo sysctl -w net.link.generic.system.hwcksum_rx=0