Performance Issue: CPU usage doesn't go down

[merarischroeder]

ISSUE:

• Program CPU usage is expected to go down, when the network speed is reduced
• It doesn't

BACKGROUND

• Testing WAN Link in Cloud using iPerf3, through a TLS encryption tool written in Rust (Tokio/Async)
• 70% at 3gbps
• 70% when limited to 1gbps

LIKELY CAUSE

• Upon write to a socket, the OS will normally quickly copy the data and return
• Trickle doesn't copy the data and return, instead when it needs to limit the speed, it sleeps