Slow upload speed in macOS guests with vmxnet3 network adapter in VMware Fusion
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Article ID: 315599
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Updated On:
Products
VMware Desktop Hypervisor
Issue/Introduction
This article provides a workaround to the slow upload speed issue seen in macOS guests like (Ventura/Monterey) with vmxnet3 network adapter.
Symptoms:
macOS Guests created in VMware Fusion with Ethernet adapter configured as vmxnet3 in x86 macbooks showing slow upload speed
Resolution
MacOS guests uses appleās vmxnet3 driver. Currently, there is no resolution.
Workaround:
As a workaround for this issue, VMware recommends to disable TSO in macOS guests.
By default TSO will be on.
sudo sysctl -a | grep net.inet.tcp.tso
Run the below command in macOS guests to turn off TSO
sudo sysctl -w net.inet.tcp.tso=0
To have any sysctl setting stick between restarts:
create a file /etc/sysctl.conf and add a below entry
net.inet.tcp.tso=0
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