Testing the localhost forwarding capabilities, the results seem unexpected. Local test: TCP forwarding speed is 13Gbps, without forwarding it’s 120Gbps, a significant difference.

[zsinba]

I downloaded the source code and compiled it, then tried it on macOS.
Download time: 2024-07-21 09:37:10
Compilation script: cargo build --release
Compiled version: rathole v0.5.0-13-gbe14d12
Compiled file size: 3895544 Jul 21 09:21 rathole (3.7M Jul 21 09:21 rathole*)
Test case: examples/iperf3
Server configuration (server.toml):

[server]
bind_addr = "0.0.0.0:2333"
default_token = "123"
[server.services.iperf3-udp]
type = "udp"
bind_addr = "0.0.0.0:5202"
[server.services.iperf3-tcp]
type = "tcp"
bind_addr = "0.0.0.0:5202"

Client configuration (client.toml):

[client]
remote_addr = "127.0.0.1:2333"
default_token = "123"
[client.services.iperf3-udp]
type = "udp"
local_addr = "127.0.0.1:5201"
[client.services.iperf3-tcp]
type = "tcp"
local_addr = "127.0.0.1:5201"

Server start command:

cd /rathole/target/release
./rathole -s ../../examples/iperf3/server.toml

Client start command:

cd rathole/target/release
./rathole -c ../../examples/iperf3/client.toml

iperf3 server startup:

iperf3-darwin -s
-----------------------------------------------------------
Server listening on 5201
-----------------------------------------------------------

iperf3 client startup (with Rathole):

iperf3-darwin -c 127.0.0.1 -t 100 -p 5202

The result maintained a speed of around 13Gbps.
Without Rathole forwarding, the startup command was:

iperf3-darwin -c 127.0.0.1 -t 100 -p 5201

The speed obtained was approximately 100Gbps.
For UDP testing, after forwarding through Rathole, the speed was:

iperf3-darwin -c 127.0.0.1 -t 100 -p 5202 -u

The speed was only 1Mbps.
Without Rathole, the UDP test command was:

iperf3-darwin -c 127.0.0.1 -t 100 -p 5201 -u

The speed was also 1Mbps, indicating that this might be the upper limit for UDP, and Rathole does not affect it.
Question:
When forwarding TCP, does the code limit the upper speed of the forwarding?
Note: This is just a local test, so the significance is limited, but the limitations are evident.

[Musixal]

iperf3-darwin -c 127.0.0.1 -t 100 -p 5201 -u -b 10G

for UDP you must define the bitrate. The default bitrate is 1Mb/s