Comment # 7 on bug 1229019 from Jim Niko

(In reply to Jim Niko from comment #6)
> I have to add something.
> 
> After some search it seems that the Intel I350 T2 NIC card does not use
> split IOMMU for each port and create this regression. On previous kernel
> each port was assigned in different groups and worked as supposed to be. 
> 
> This is the IOMMU group on the 6.4.0-150600.23.17-default kernel:
> 
> 0b:00.0 Ethernet controller: Intel Corporation I350 Gigabit Network
> Connection (rev 01)
> 	Subsystem: Intel Corporation Ethernet Server Adapter I350-T2
> 	Kernel driver in use: igb
> 	Kernel modules: igb
> 0b:00.1 Ethernet controller: Intel Corporation I350 Gigabit Network
> Connection (rev 01)
> 	Subsystem: Intel Corporation Ethernet Server Adapter I350-T2
> 	Kernel driver in use: igb
> 	Kernel modules: igb
> 
> Now if I pass through both ports on the same VM it works ok. 
> 
> If I try to pass through 1 port it creates the regression.
> 
> I hope to be fixed soon this because we have 11 servers which have the same
> problem and can not be updated........

It seems that the SR-IOV is not working at all...... tried now with quad port
Intel I350 with the same result....