[Cake] Cake strange behaviour

Sebastian Moeller moeller0 at gmx.de
Sat Jul 16 09:37:22 EDT 2016

Hi Kevin,

Silly idea, use the Windows rollback point (or what is it called) from before the update and then run Windows upgrade again.


On July 16, 2016 1:53:20 PM GMT+02:00, Kevin Darbyshire-Bryant <kevin at darbyshire-bryant.me.uk> wrote:
>On 16/07/16 11:59, Dave Täht wrote:
>> I would repeat the same test with htb+fq_codel.
>Hi Dave,
>That's more challenging than it sounds - reproducing the test scenario 
>would require the windows box going back in time.  What could it be 
>doing that so far any of the flent tests fail to replicate?  Hmmm, so 
>far I've used a local flent server...I wonder if RTT is at play here?
>> On 7/16/16 11:35 AM, Kevin Darbyshire-Bryant wrote:
>>> Hi guys,
>>> Encountering some behaviour that I don't understand.  Line is a
>>> cake limited to 39000/9840. Overheads 12, 'dual-dsthosts' in
>>> 'dual-srcshosts' on engress - limiting the on the WAN line. Take a
>>> at my ping response graph
>>> Around 20:30 I fired up a windows machine that was behind on its
>>> so it generated a bit of ingress traffic.  Note the comparatively
>>> latency (40ms) and stupidly high ping packet loss (50%)  The 3-5ms
>>> steady (blue) latency you can see is a system backup (so egress
>>> running till around 23:00.
>>> The really strange bit is that cake stats show it has only dropped
>>> (yes 10!) packets.
>>> I'm not the only person encountering 'interesting' behaviour with
>>> to windows updates inducing high latency and high packet loss.  It's
>>> if cake weren't there managing flows and this is the ISP's rate
>>> in action.
>>> Kevin
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