[Cake] Configuring cake for VDSL2 bridged connection

Alan Jenkins alan.christopher.jenkins at gmail.com
Wed Aug 24 13:16:08 EDT 2016

The RRUL graph shows 4 simultaneous flows.  The total of 4 flows 
averaging 7Mb/s is 28Mb/s :).

I think it's more obvious when you know what the legend means. The flows 
have different service markings (which may or may not have any effect).

BE = "Best effort" (neither high nor low priority)
BK = Background
EF = "Expedited forwarding"

I think CS5 is another high priority mark.  The abbreviation doesn't 
mean anything specific, it's just how it's coded really...  it's a bit 
of a swamp, because there's no standard that works internet-wide, even 
for a low priority mark.  IIRC there's one mark that ends up being 
treated as low priority in one "standard" and high priority in another.

On 24/08/16 18:03, techicist at gmail.com wrote:
> My apologies again. The link should be, http://imgur.com/6DrMJKI
> On 24 August 2016 at 18:03, techicist at gmail.com <techicist at gmail.com> wrote:
>> Many apologies, the link should be, http://imgur.com/6DrMJKI.
>> On 24 August 2016 at 18:01, techicist at gmail.com <techicist at gmail.com>
>> wrote:
>>> 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,
>>> http://imgur.com/6DrMJKI.
>>> 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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>>>>> Cake at lists.bufferbloat.net
>>>>> https://lists.bufferbloat.net/listinfo/cake
>>>> --
>>>> Sent from my Android device with K-9 Mail. Please excuse my brevity.
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