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Slow upload speed when using vmxnet3 with macOS Mojave

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Hey everyone,

 

I have a late 2018 Mac Mini with the latest version of macOS Mojave 10.14.4 (18E226) hosting two guests with the Mojave as well. I am running the latest version of VMware Fusion 11 Pro. I ordered the Mac Mini with a 10GbaseT ethernet NIC and would like to use the guests at that speed too, if possible.

 

In macguest1 I changed ethernet0.virtualDev to "e1000e", which is only gigabit speeds, and in macguest2 I changed that to "vmxnet3", which should have full 10 gig speeds. Then I installed speedtest-cli from Homebrew and the results are really terrible:

 

in macguest1:

 

macguest1:~ admin$ speedtest

Retrieving speedtest.net configuration...

Testing from Elisa Oyj (x.x.x.x)...

Retrieving speedtest.net server list...

Selecting best server based on ping...

Hosted by Elisa Oyj (Helsinki) [1.31 km]: 2.075 ms

Testing download speed................................................................................

Download: 919.85 Mbit/s

Testing upload speed................................................................................................

Upload: 743.70 Mbit/s

 

and in macguest2:

 

macguest2:~ admin$ speedtest

Retrieving speedtest.net configuration...

Testing from Elisa Oyj (x.x.x.x)...

Retrieving speedtest.net server list...

Selecting best server based on ping...

Hosted by Elisa Oyj (Helsinki) [1.31 km]: 2.087 ms

Testing download speed................................................................................

Download: 806.86 Mbit/s

Testing upload speed................................................................................................

Upload: 1.68 Mbit/s

 

 

It looks like download speed is fine in both VMs, but the upload speed with macguest2, using a virtual 10gig interface, has a maximum speed of <2Mbit/s! I ran this test multiple times from multiple ISPs and got the same results.

 

If I switch this to "e1000e" on macguest2, then the upload speed matches macguest1, so it's not an issue with the VM.

 

Both have the latest version of VMware Tools installed:

 

macguest1:~ admin$ /Library/Application\ Support/VMware\ Tools/vmware-tools-cli -v

10.3.2.6765 (build-9925305)

 

macguest2:~ admin$  /Library/Application\ Support/VMware\ Tools/vmware-tools-cli -v

10.3.2.6765 (build-9925305)

 

This is a really weird issue and I'm not sure what to test next. Has anyone else seen this on their end?

 

Thanks!

-Miguel


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