> On 13 Dec 2019, at 23:39, Thibaut <[email protected]> wrote:
>
> Hi Jonathan,
>
>> On 13 Dec 2019, at 15:02, Jonathan Morton <[email protected]> wrote:
>>
>>> On 13 Dec, 2019, at 3:43 pm, Thibaut <[email protected]> wrote:
>>>
>>> I've been using CAKE on my DSL-connected Linux router for the last few
>>> years, and it worked well until very recently. Two things happened:
>>>
>>> 1) My ISP (French "Free") switched my DSLAM to native IPv6, which for the
>>> time being means that I had to revert to using their set-top-box (Freebox)
>>> instead of the VDSL2 model I was using in bridge mode until then (CAKE in
>>> "bridged-ptm ether-vlan" mode)
>>> 2) I upgraded my router from 3.16 (Devuan Jessie) to 4.9 (Devuan ASCII)
>>>
>>> Since then, no matter which setup I use, I cannot get CAKE to work as
>>> intended. Specifically, any long-standing best effort stream (such as a
>>> remote rsync) will be throttled to a near grinding halt even though there
>>> is no other significant traffic going on. Some random bursts can be seen
>>> (with iftop) but nothing ever gets close to half the maximum bandwidth.
>>> This is notably affecting the OpenWRT buildbots I'm hosting on this link.
>>
>> Old kernels, including 4.9 series, tend to be more problematic than the
>> latest ones. If you can, I would recommend updating to a 5.x series kernel,
>> in which Cake is an upstream feature. I won't presume to guess how best to
>> achieve that with your distro.
>
> I’m now able to confirm this looks like a regression: I was able to retrieve
> and build the last known working version of CAKE on my router, and with an
> adjusted overhead of 48 atm (confirmed thanks to the help of Stephan), it
> works like a charm. Current HEAD doesn’t, with the exact same parameters.
I meant Sebastian, sorry. And this is old CAKE running on distro 4.9, for the
sake of clarity
Thibaut
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