Hyper-V Legacy NIC
I'm running a Gen1 Hyper-V VM with legacy NIC's and non-legacy NIC's due to the amount of NIC's that we require for the pFsense instance.
We see issues with the CPU running almost 100% and from what I see in the system activity logs there's reference to the three legacy NIC interfaces so I'm thinking the issues is related to that. This doesn't happen all the time and isn't related to the amount of traffic going through the firewall, the VM has plenty of resources to cope with the traffic etc.
I've had a quick search around and I've spotted a few posts which say to not use legacy NIC's when using Hyper-V but nobody says why.
My question here is; can anyone shed any light on why not to use legacy NIC's for Hyper-V VM's? or is it just because the nonlegacy NIC's have better drivers?
IIRC, legacy NICs are limited to 100Mbps.