CPU Direct USB

USB latency analyzer that counts chips between your input devices and the CPU. Fewer chips = lower latency.

Quick Start

Run in PowerShell:

irm https://tools.mariusheier.com/cpudirect.ps1 | iex

Run in bash:

curl -fsSL https://tools.mariusheier.com/cpudirect.bash | bash

or

wget -qO- https://tools.mariusheier.com/cpudirect.bash | bash

What It Shows

• CHIP 0: Device connects directly to CPU (lowest latency)
• CHIP 1: Device goes through chipset (adds latency)
• CHIP 2+: Device goes through USB hub(s) (more latency)

Features

• Identifies all USB input devices (mice, keyboards, controllers)
• Shows USB controller topology (Intel/AMD CPU-integrated vs chipset)
• Detects MSI interrupt status
• Identifies USB hubs in the path
• Suggests optimizations (disable selective suspend, enable MSI)

Verification

All releases include SHA256 checksums. To verify:

Powershell:

(Get-FileHash cpudirect.ps1 -Algorithm SHA256).Hash

bash:

sha256sum cpudirect.bash

Compare with the checksum in the release notes.

License

MIT