If you are also facing similar problem or you want to load any other kernel module during startup(boot) of the Linux machine follow below steps.
NOTE: I am using SuSE Linux Enterprise System 11 SP4 hence the files and the commands used might not work on other variant of Linux.
Verify if vmxnet3 module is provided by kernel
# find / -name vmxnet3*.ko
A more generic command to list kernel modules is
# modprobe --list | grep -i vmxnet
So this validates that vmxnet3 is available within my kernel, so lets check if it is installed/loaded on my system
# lsmod | grep -i vmxnet3
If you don't get any output so it means vmxnet3 module is not loaded on your machine
Add the module name with "MODULES_LOADED_ON_BOOT" variable in the below file
# vi /etc/sysconfig/kernel
MODULES_LOADED_ON_BOOT=" ipmi_devintf ipmi_si vmxnet3"
Save and exit the file.
You can validate your configuration changes followed by a reboot with below command
# lsmod | grep -i vmxnet
vmxnet3 54163 0
As you see vmxnet3 module is loaded now.
If you want to avoid doing a reboot then you can manually load/activate a module using below command
# modprobe vmxnet3
This will activate your vmxnet3 module
# lsmod | grep -i vmxnet vmxnet3 54163 0
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