tun-rs Performance Test Report

Testing method: Utilize a TUN proxy for traffic.

Data flow path: TcpStream.write -> tun.recv -> tun.send -> TcpStream.read

Linux

machine: ubuntu 24C/32G

Asynchronous(Tokio)

Mode	Send Speed (MB/s)	Receive Speed (MB/s)
recv/send	700.22	697.96
recv/send+channel	855.59	853.03
TSO	719.96	718.19
TSO + Channel	1308.58	1306.02
multi-queue	669.39	667.37

Synchronous

Mode	Send Speed (MB/s)	Receive Speed (MB/s)
recv/send	869.58	866.24

• The TSO + Channel combination provides the best throughput, achieving approximately 86.8% improvement over the standard mode.
• Using Channel alone improves performance by 22.2% compared to the standard mode.
• TSO alone provides a slight improvement, about 2.8% higher than the standard mode.
• Multi-queue performs slightly worse for a single connection.
• Consider prioritizing the TSO + Channel approach to achieve optimal performance.

Windows

machine: Windows11 24C/32G

Asynchronous(Tokio)

Mode	Send Speed (MB/s)	Receive Speed (MB/s)
recv/send	333.20	329.02
recv/send+channel	340.94	337.52

Synchronous

Mode	Send Speed (MB/s)	Receive Speed (MB/s)
recv/send	250.34	247.19

• Windows is limited by Wintun, resulting in poor performance.
• Asynchronous is superior to synchronous, with a performance improvement of approximately 30%.