[Cake] Configuring cake for VDSL2 bridged connection

techicist at gmail.com techicist at gmail.com
Wed Aug 24 13:01:15 EDT 2016

I have today been using flent to do RRUL tests with the values set at 50%.

I have uploaded the first test I have performed. It can be seen at,

I'm a bit confused why the DS speed is only 7Mb/s when every other speed
test I have done is around 28Mb/s (as it should be). Can anyone explain why
this might be? Am I doing something wrong?

I would appreciate an expert analysis of the graph, if possible :)

On 23 August 2016 at 21:09, Sebastian Moeller <moeller0 at gmx.de> wrote:

> 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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> >https://lists.bufferbloat.net/listinfo/cake
> --
> Sent from my Android device with K-9 Mail. Please excuse my brevity.
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