[Cake] Beating bufferbloat

Alec Robertson alecrobertson13 at gmail.com
Sat Apr 23 18:22:54 EDT 2016

Dear All,

I’ve realised that I have been responding to Kevin rather than to the mailing list - my bad!

I think I will purchase a Linksys WRT1900ACS as it seems to be fairly well regarded and is easily accessible in the UK.

How do I go about setting up Cake on it?

Alec Robertson

On 23 April 2016 at 9:00:52 pm, Alec Robertson (alecrobertson13 at gmail.com) wrote:

Dear Kevin,

I did look at the Linksys WRT1200AC but it seems to get some rather poor reviews on Amazon?

Alec Robertson

On 23 April 2016 at 8:58:02 pm, Kevin Darbyshire-Bryant (kevin at darbyshire-bryant.me.uk) wrote:

On 23/04/2016 20:42, Alec Robertson wrote:
Dear Kevin,

That’s very useful thanks.

You say the TP-LINK Archer C7 should just be okay. What could I get that I know will last me for a long time? What’s got good WiFi range too?
The honest answer is I've absolutely no idea and I'm in that dilemma myself.  There's a remake of the linksys WRT range (WRT1200????) that apparently is very powerful, I guess the issue is how far along OpenWrt is.  I might have the wrong end of hte stick but I think Dave Taht may have something working.

Apologies, I'm not really a mine of information.

I’m using powerline at the moment but fed up with it disconnecting. I think it is probably the TP-LINK adaptors I am using (known issue apparently) but wiring up the house is unpractical at the moment. I don’t think there is a better solution really.

Alec Robertson

On 23 April 2016 at 8:00:00 pm, Kevin Darbyshire-Bryant (kevin at darbyshire-bryant.me.uk) wrote:

Hi Alec,

I'm not familiar with TalkTalk but they sound like they do similar
things to Sky - Sky just need a 'login ID' as part of the DHCP request
packet (which funnily enough are the PPPoA/E login details)

In terms of speed sacrifice, erm, none really. I've set 40mpbs incoming
and 9990kbps for outgoing on a 40000/9999 link as reported by the
modem. Probably critically I've set the packet overheads to 12, and I
now can't remember why... there's an on-wire vlan tag (4 bytes) but the
reason for the other 8 have fallen out of the brain cell.

I've a semi-regular backup job overnight that on a bad day overruns into
the day - a week or so ago it ran for something like 2 days and I had
absolutely no idea - thinkbroadband's ping monitor was registering
something like an extra 5mS latency over the baseline, peaks were
something like 25mS - backup stats and openwrt's stats package were
registering the full 10mbps uplink in use during that time.

Does that help?


On 23/04/16 19:40, Alec Robertson wrote:
> Dear Kevin,
> I am on TalkTalk which uses IPoE, so no PPPoE use at all, as far as I
> know. I certainly haven’t ever configured login details.
> How much speed do you have to sacrifice on your connection to
> eliminate bufferbloat?
> --
> Alec Robertson
> On 23 April 2016 at 10:46:35 am, Kevin Darbyshire-Bryant
> (kevin at darbyshire-bryant.me.uk <mailto:kevin at darbyshire-bryant.me.uk>)
> wrote:
>> Hi Alec,
>> A brief appearance from me whilst I have a spare few seconds.
>> Not stupid!
>> There’s an obvious question: Why are Billion still shipping buffer
>> bloated devices? Have they been sent graphs/demos/logs of how their
>> kit is faulty?
>> To offer some hopefully constructive pointers: For FTTC service I’m
>> guessing you’ll be using the Billion as a vdsl modem. Who’s the ISP?
>> AFAIK anyone other than Sky will need to run PPPoE and hence hit the
>> 1492 MTU restriction *unless* the Billion supports mini jumbo frames
>> on the ethernet side and the PPPoE MTU extension (the rfc number
>> escapes the brain at the moment) Sky don’t use PPP and just run
>> ethernet frames over PTM…..the way it should be. The incoming
>> packets from ISP to you are policed at something close to sync rate,
>> this is part of the BT specification. The uplink of course can be as
>> bloated as hell ;-)
>> I use an Archer C7 with BT’s equally horrendously bloated HG612 vdsl
>> modem on a 40/10 link with sky as my isp. In terms of CPU usage it’s
>> about 1% per megabit so a full 40/10 uses around 55% cpu, I think
>> there’s enough for your 60/20…just.
>> https://middling.me.uk/blog/2015/03/customising-openwrt-to-my-needs/
>> offers further advice which I found useful.
>> Kevin
>>> On 22 Apr 2016, at 23:01, Alec Robertson <alecrobertson13 at gmail.com
>>> <mailto:alecrobertson13 at gmail.com>> wrote:
>>> Hi all,
>>> I’ve been out of the bufferbloat game for a while and want to try
>>> and beat it once again.
>>> I’ve got an FTTC connection (UK) which I get around 60Mbps on but
>>> with horrible bufferbloat on my Billion 8800NL. What router should I
>>> get that can run OpenWRT and handle this connection? Do the newest
>>> builds of OpenWRT have cake built-in now via sqm-scripts or would I
>>> need to install this manually. If so, how would I do this?
>>> Would appreciate any help and apologies if I come off in any way stupid.
>>> --
>>> Alec Robertson
>>> _______________________________________________
>>> Cake mailing list
>>> Cake at lists.bufferbloat.net <mailto:Cake at lists.bufferbloat.net>
>>> https://lists.bufferbloat.net/listinfo/cake


Kevin at Darbyshire-Bryant.me.uk
M: +44 7947 355344 H: +44 1256 478597
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