[Cake] Configuring cake for VDSL2 bridged connection

[Sebastian Moeller]

Hello techicist,

On August 23, 2016 5:13:19 PM GMT+02:00, "techicist at gmail.com" <techicist at gmail.com> wrote:
>Hello,
>
>Thank you for your quick reply.
>
>I take it that one of the DHCPs should read PPPoE?
>
>
>Yes, you are quite correct. It should read: "TalkTalk uses DHCP to
>obtain
>an IP address and not PPPoE as most other ISPs do." But I think you
>understood that :)
>
>My sync speeds on VDSL2 have been very stable for the last 84+ days so
>my
>calculated figures will stay the same for some time, I would like to
>think.

Yes, that is what I see as well.

>My DS sync speed is 58976Kbps and thus I have calculated a reference
>value
>of 58068Kbps based on your formula. The US sync speed is 10422Kbps and
>the
>reference value for this is 10261Kbps.
>
>Setting the reference values to 50%, I have: 29034Kbps for the DS; and
>5130Kbps for the US. I will test with these numbers shortly. Am I right
>to
>assume I can just paste these into the SQM interface on LuCI? 

       Yes, that should work.

>I will set
>the "Queuing discipline" to *cake* and the "Queue setup script" to
>*piece_of_cake.qos*.
>
>I assume also at this stage, to set "Which link layer to account for"
>as *none
>(default)*?

        Should work, but also Ethernet should work, as long as you do not specify anything, or rather -14 ;)

>
>I will then increment the values I have pasted into LuCI (assuming that
>is
>correct) as you have said. At this point, with an assumed overhead of
>8, do
>I just choose *Ethernet with overhead...* and then set the "Per Packet
>Overhead (byte)" to *8*?

Yes. In essence that is the trick, it might make sense to look at cake' statistics especially the max length field, which if you have lla set at none reach 1514 if the kernel automatically adds it's 14 bytes.


>
>Is there any benefit of going through UCI?

        Only if you despise the GUI or only have ssh access, I guess... Functionally it should boil down to the same, as the GUI simply fills /etc/config/sqm with values and then calls /etc/init.d/sqm to actually start the scripts...

Best Regards
        Sebastian


>
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