[Cerowrt-devel] SQM and PPPoE, more questions than answers...

Sebastian Moeller moeller0 at gmx.de
Wed Oct 15 09:39:27 EDT 2014

Hi Edwin,

On Oct 15, 2014, at 14:02 , Török Edwin <edwin+ml-cerowrt at etorok.net> wrote:

> On 10/15/2014 03:03 AM, Sebastian Moeller wrote:
>> 	I guess it is back to the drawing board to figure out how to speed up the classification… and then revisit the PPPoE question again…
> FWIW I had to add this to /etc/config/network (done via luci actually):
> option keepalive '500 30'
> Otherwise it uses these default values from /etc/ppp/options, and then I hit: https://dev.openwrt.org/ticket/7793:
> lcp-echo-failure 5
> lcp-echo-interval 1
> The symptomps are that if I start a large download after half a minute or so pppd complains that it didn't receive reply to 5 LCP echo packets and disconnects/reconnects.

	I have not yet seen these in the logs, but I will keep my eyes open.

> Sounds like the LCP echo/reply packets should get prioritized, but I don't know if it is my router that is dropping them or my ISP.

	I think that is something we should be able to teach SQM (as long as the shaper is running on the lower ethernet interface and not the pppoe interface). 

> When you tested PPPoE did you notice pppd dropping the connection and restarting, cause that would affect the timings for sure…

	Nope, what I see is simply more variance in bandwidth and latency numbers and a less step slope on a right shifted ICMP CDF… I assume that the disconnect reconnects should show up as periods without any data transfer…. 

Mmmh, I will try to put the PPP service packets into the highest priority class and see whether that changes things, as well as testing your PPP options.

Thanks for your help


> Best regards,
> --Edwin
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