Windows 10: Virtual Switch External chokes bandwidth

I have two Dell computers, one Latitude work and other Inspiron home.


I tried create a new Hyper V Virtual Switch External.


The Latitude works fine but the Inspiron chokes the bandwidth to 1/10 th or even less.


Both m/c s are on Windows Pro.

:)

 

Slow download speed after creating Hyper-V External Virtual Switch

Have you set the number of cores to 8 in hyer-v settings (virtual processor). No idea otherwise.

 

Slow download speed after creating Hyper-V External Virtual Switch

Hello.
After buying a new PC (its specs are on my profile), enabling Hyper-V and creating a new External Virtual Switch, I notice that the download speed drops dramatically. My internet conneciton is 1Gbps down and 200Mbps up.

Without External Virtual Switch:

• Speedtest (I get 944 Mbps download, and 214 Mbps upload) --> Speedtest.net by Ookla - My Results
• CPU usage while on Speedtest (no core is maxed out):

• Iperf with a host on the same LAN (upload 911Mbps, download 777Mbps):

• Lan Speed test (746 Mbps upload and 716 Mbps download):

With External Virtual Switch:

• Speedtest result (I get 378 Mbps download and 212 Mbps upload) --> Speedtest.net by Ookla - My Results

• CPU usage while on Speedtest (notice the first core is fully maxed out):

• Lan Speed Test (742 Mbps upload and 596Mbps download):

• Iperf with a host on the same LAN (upload 861 Mbps, download 583 Mbps):

• CPU usage while on Iperf (download) - Notice, once again, Core 1 fully maxed out​:

Conclusion

When the External Virtual Switch is enabled, I assume the download speed is lower due to the fact one CPU core is being maxed out, my question is why? Why isn't the load spread throughout the cores?
Is anyone experiencing a similar issue?

Regards.

 

Hyper-V - Unable to Create External Virtual Switch


Nothing is listed:





Kevin