Using Cake on Gigabit Fibre with Forced PPPoE

[jonesing]

I installed OpenWRT x86 (i7-4790k, 1g intel nic).
Ran a 1gbe ethernet cable from my ISP modem (FTTH 1gb symmetrical) to my x86 openwrt.
Set up PPPoE (I am forced to because modem has no bridge mode/legal bypass method).
Set up Cake (Pre-cake, I was still getting a little bufferbloat on download, and a severe amount on upload).

For the Link Layer Adaption settings, I am using an overhead of 44 and an MPU of 84 per the SQM guide on the OpenWRT wiki. Is this correct even for my PPPoE/OpenWRT setup as my setup is technically ethernet but has a fibre connection right before it? Should I just use an MPU of 96 to overestimate as per the guide says?

Also, since my ISP doesn't give me an IPv6 address, should I delete the wan6 interface, or is it still in use locally between devices on my network?

[jonesing]

Update: It is now to my understanding that PPPoE is already taken into account within the 44 bytes of overhead so I guess I was headcasing about the overhead/MPU values when the fibre/ethernet recommened values were fine.Also I went ahead and just deleted the wan6 interface because I have previously done it before for a different reason, when I was getting an IPv6 address from a different ISP, and I had no issues with doing so.