[Cerowrt-devel] Correct syntax for cake commands and atm issues.

[Sebastian Moeller]

Hi Fred,

your results seem to indicate that cake is not active at all, as the latency under load is abysmal (a quick check is to look at the median in relation to the min and the 90% number, in your examples all of these are terrible). Could you please post the result of the following commands on your router:
1) cat /etc/config/sqm
2) tc -d qdisc
3) tc -d class show dev pppoe-wan
4) tc -d class show dev ifb4pppoe-wqn
5) /etc/init.d/sqm stop
6) /etc/init.d/sqm start

hopefully these give some insight what might have happened.

And finally I would love to learn the output of:
sh betterspeedtest.sh -4 -H netperf-eu.bufferbloat.net -t 150 -p netperf-eu.bufferbloat.net -n 4 ; sh netperfrunner.sh -4 -H netperf-eu.bufferbloat.net -t 150 -p netperf-eu.bufferbloat.net -n 4


Many Thanks & Best Regards
	Sebastian

On Jul 10, 2015, at 20:25 , Fred Stratton <fredstratton at imap.cc> wrote:

> By your command
> Rebooted to rerun qdisc script, rather than changing qdiscs from the command-line, so suboptimal process as end-point changed.
> 
> script configuring qdiscs and overhead 40 on
> 
> sh netperfrunner.sh -H netperf-eu.bufferbloat.net -p 2.96.48.1
> 2015-07-10 18:22:08 Testing netperf-eu.bufferbloat.net (ipv4) with 4 streams down and up while pinging 2.96.48.1. Takes about 60 seconds.
> Download:  6.73 Mbps
>   Upload:  0.58 Mbps
>  Latency: (in msec, 62 pings, 0.00% packet loss)
>      Min: 24.094
>    10pct: 172.654
>   Median: 260.563
>      Avg: 253.580
>    90pct: 330.003
>      Max: 411.145
> 
> script configuring qdiscs on flows raw
> 
> sh netperfrunner.sh -H netperf-eu.bufferbloat.net -p
> 78.145.32.1
> 2015-07-10 18:49:21 Testing netperf-eu.bufferbloat.net (ipv4) with 4 streams down and up while pinging 78.145.32.1. Takes about 60 seconds.
> Download:  6.75 Mbps
>   Upload:  0.59 Mbps
>  Latency: (in msec, 59 pings, 0.00% packet loss)
>      Min: 23.605
>    10pct: 169.789
>   Median: 282.155
>      Avg: 267.099
>    90pct: 333.283
>      Max: 376.509
> 
> script configuring qdiscs and overhead 36 on
> 
> sh netperfrunner.sh -H netperf-eu.bufferbloat.net -p
> 80.44.96.1
> 2015-07-10 19:20:18 Testing netperf-eu.bufferbloat.net (ipv4) with 4 streams down and up while pinging 80.44.96.1. Takes about 60 seconds.
> Download:  6.56 Mbps
>   Upload:  0.59 Mbps
>  Latency: (in msec, 62 pings, 0.00% packet loss)
>      Min: 22.975
>    10pct: 195.473
>   Median: 281.756
>      Avg: 271.609
>    90pct: 342.130
>      Max: 398.573
> 
> 
> On 10/07/15 16:19, Alan Jenkins wrote:
>> 
>> I'm glad to hear there's a working version (even if it's not in the current build :).
>> 
>> Do you have measurable improvements with overhead configured (v.s. unconfigured)?
>> 
>> I've used netperfrunner from CeroWrtScripts, e.g.
>> 
>> sh netperfrunner.sh -H netperf-eu.bufferbloat.net -p $ISP_ROUTER
>> 
>> I believe accounting for overhead helps on this two-way test, because a) it saturates the uplink b) about half that bandwidth is tiny ack packets (depending on bandwidth asymmetry).  And small packets have proportionally high overhead.
>> 
>> (But it seems to only make a small difference for me, which always surprises Seb).
>> 
>> Alan
>> 
>> On 10/07/15 15:52, Fred Stratton wrote:
>>> 
>>> You are absolutely correct.
>>> 
>>> I tried both a numeric overhead value, and alternatively 'pppoe-vcmux'
>>> and 'ether-fcs' in the build I crafted based on r46006, which is lupin
>>> undeclared version 2. Everything works as stated.
>>> 
>>> On lupin undeclared version 4, the current release based on r46117, the
>>> values were not recognised.
>>> 
>>> Thank you.
>>> 
>>> I had cake running on a Lantiq ADSL gateway running the same r46006
>>> build. Unfortunately this was bricked by attempts to get homenet
>>> working, so I have nothing to report about gateway usage at present.
>>> 
>>> 
>>> 
>>> On 10/07/15 13:57, Jonathan Morton wrote:
>>>> 
>>>> You're already using correct syntax - I've written it to be quite
>>>> lenient and use sensible defaults for missing information. There are
>>>> several sets of keywords and parameters which are mutually orthogonal,
>>>> and don't depend on each other, so "besteffort" has nothing to do with
>>>> "overhead" or "atm".
>>>> 
>>>> What's probably happening is that you're using a slightly old version
>>>> of the cake kernel module which lacks the overhead parameter entirely,
>>>> but a more up to date tc which does support it. We've seen this
>>>> combination crop up ourselves recently.
>>>> 
>>>> - Jonathan Morton
>>>> 
>>> 
>> 
> 
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