ccifra / wsl-sockets-perf

Raw Sockets Performance Testing

Testing performance of raw sockets between windows client and WSL2 Host

• Tests TCP sockets over localhost
• Tests Hypervisor sockets

These test use port 50051 for TCP connections, and port 50053 for hypervisor sockeets connections

Setup

You must get the GUID of the WSL client VM by running the following from an Administrator PowerShell

hcsdiag list

You must register the test client "integration service" with Windows, From Administrator PowerShell:

$friendlyName = "HV Socket Test"
$service = New-Item -Path "HKLM:\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Virtualization\GuestCommunicationServices" -Name "0000C384-facb-11e6-bd58-64006a7986d3"
$service.("ElementName", $friendlyName)

The GUID that we are setting in the registry is the HV_GUID_VSOCK_TEMPLATE, meaning <port>-facb-11e6-bd58-64006a7986d3 In our case the port we are setting is 50053 (0000C384 in hex)

If you do not register the service you will get an unathorized error trying to connect

When you run the client you have to pass the VM ID GUID on the command line.

Building the Linux Server

g++ linux_server.cc -o server

Building the Windows Client

mkdir build
cd build
cmake ..
cmake --build . --config Release

Run the Tests

TCP Performance

Windows localhost

sockets_server

sockets_client

Windows to WSL

Linux

./server

Windows

sockets_client

VSOCK Performance

Linux

./server -vsock

Windows

sockets_client.exe -vsock FC65AFDB-069B-4AB0-ACBF-274C34BF8593

Replace the GUID with the VM ID you found with hcsdiag list

Results

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My Results (XIDAX Machine (AMD Ryzen 9 3900X 12-Core Processor 3.80 GHz), Windows 10, Ubuntu 20.04 WSL2)

Windows localhost
Latency 18us, handshaked throughput 4675 MB/s, non handshaked throughput 4769.52 MB/s

WSL TCP
Latency 134us, handshaked throughput 115.6 MB/s, non handshaked throughput 127.5 MB/s

WSL VSock
Latency 56us, handshaked throughput 1323 MB/s, non handshaked throughput 1872.7 MB/s

Useful Links

• https://stackoverflow.com/questions/60696166/using-the-hyper-v-sockets-between-windows-host-and-linux-guest
• https://github.com/Biswa96/wslbridge2/tree/master/samples
• https://docs.microsoft.com/en-us/virtualization/hyper-v-on-windows/user-guide/make-integration-service