Shared WiFi Vswitch net speed being throttled

Question

Shared WiFi Vswitch net speed being throttled

Chris Biliti 0

Something is wrong with the Hyper-V bridge adapter for Wi-Fi.

Had a virtual switch created to bridge the net adapter for Wi-Fi, speed was capped at 100Mb down 0.3Mb up. (Lan speed to the Wi-Fi router right next to the computer is 600Mb down 200 up.) Disabling and deleting the external shared Wi-Fi VSwitch returned speeds to normal.

I need the Wi-Fi bridge with my vm configurations, but I am not sure what could be causing the throttling issue. Any thoughts on what to check to troubleshoot?

No updates are pending

Windows 11 23h2

HyperV Manager Version: 10.0.22621.1

essjae 461 Reputation points

2023-11-06T10:47:47.2333333+00:00
This has been an issue with Hyper-V for years.

try this: https://www.tenforums.com/virtualization/183576-very-slow-up-download-speeds-hyperv-external-switch-setup.html

Problem no.1: Slow download Disable coalescing on the Wifi-card. This completely restored my download speed and resolved issues I was seeing with intermittent connectivity in the host OS and on VMs.

Problem no.2: Slow upload Disable Large Send Offload on the Virtual adapter representing the external switch. In my case called vEthernet(WAN)

also:

https://superuser.com/questions/1371759/creating-an-external-virtual-switch-on-hyper-v-causes-host-to-experience-very-sl/1375670#1375670

vEthernet adapter configured for External access pointing to the WiFi adapter

Set “Recv Segment Coalescing (IPv4)” to “Disabled”

Set “Recv Segment Coalescing (IPv6)” to “Disabled”

Set “Large Send Offload Version 2 (IPv4)” to “Disabled”

Set “Large Send Offload Version 2 (IPv6)” to “Disabled”

WiFi adapter

Set “D0 PacketCoalescing” or “Packet Coalescing” to “Enable” (or “Disable”—sometimes changing this setting makes things faster even though one setting used to be better—it doesn’t seem consistent). This setting may not make a difference. Try skipping this step and see if the above vEthernet changes are sufficient first.

Inside of the VM itself, I found I also have to do:

Ethernet adapter

Set “Large Send Offload Version 2 (IPv4)” to “Disabled”

Set “Large Send Offload Version 2 (IPv6)” to “Disable