Re: Slow VMXNET3 performance on 10gig connection

I ran into the same issue as well on ESXi 5.0 U2 + Redhat 6.x. RH 5.x works just fine, but RH6.x just stinks. VMware is aware of this. in the mean time here is the solution (the vmware KB on LRO is slightly off).

Disable LRO - DocWiki

or this:

esxcli system settings advanced set --int-value 0 -o /Net/VmxnetSwLROSL

esxcli system settings advanced set --int-value 0 -o /Net/Vmxnet3SwLRO

esxcli system settings advanced set --int-value 0 -o /Net/Vmxnet3HwLRO

esxcli system settings advanced set --int-value 0 -o /Net/Vmxnet2SwLRO

esxcli system settings advanced set --int-value 0 -o /Net/Vmxnet2HwLRO

Hope this ends the misery for all!