Re: [Cerowrt-devel] Problems testing sqm (solved)

[Sebastian Moeller <moeller0@gmx.de>]

Hi Richard,

On Oct 25, 2015, at 21:02 , Richard Smith <smithbone@gmail.com> wrote:

> On 10/25/2015 01:36 PM, Rich Brown wrote:
> 
>> We really do believe in this stuff. We've seen it work. But each of
>> us is enough of a scientist to believe that *we could be wrong*. (I
>> suspect that's why you really got everyone's attention)
> 
> Indeed.  An earlier version of the effort is running nicely on our gateway at work and that's what keeps the VoIP working.   I was pretty certain I was the source of the problem I just didn't know where.
> 
>> But, what a relief! Science Triumphs again! And now that we have a
>> sound basis for understanding what was wrong, a) we have one more
>> item for our troubleshooting questionnaire, and b) we can go back to
>> feeling just a little bit smug :-)
>> 
>> Thanks for sticking with us.
> 
> Absolutely, Thanks for being patient.

	I believe we are a rather friendly bunch (but who does not have that self image) and will put observed data before theory any day ;)

> 
>> Rich
>> 
>> PS We'd love to hear the results of the experiment you really were
>> trying to perform.
> 
> Working on it...  I've run into a small snag in that I can't seem to
> return back to Linksys stock.  For some reason the flash upload goes
> really, really, slow (I verified I'm using wired) and the upload times out before it completes.

	Ihink I read in the openwrt forum people use the serial/jtag port for such things, but the memory is dim and the thread by now has reached like 900 pages or so...

> 
> scping the linksys image to /tmp and trying with sysupgrade doesn't work
> either.  I thought being sort of based on openwrt it might work...
> 
> In the mean time I have some rrul logs running under designated driver.  I've put them here:
> 
> https://drive.google.com/folderview?id=0B-P0wCbNmKvANUY4bmZteGw5Wlk&usp=sharing
> 
> *nosqm* is with sqm disabled.
> 
> *sqm-<N>-<N>* is with the ingress/egress set to N in MBits/s.  using the
> simple.qos discipline.

	Cool! I note it seems you are running an older flent version (or maybe even before the big rename, so netperf-wrapper). I think current flent includes enough improvements to merit a switch; I especially like “--remote-metadata=root@gw.home.lan” option to collect some data from the DUT automatically and save these into the output file, making it easy to answer a few question about the configuration used a few days/hours after the fact). 
	Also I want to note that if you shape ethernet you should use the link layer adaptation built into sqm (configurable via the GUI): Select Ethernet with overhead and specify the overhead to be: 24 Bytes (ethernet pre-amble & interframe gap & FCS,  Linux will have already accounted for MACs & frame type 14 bytes, you may need to add vlan tag (4 additional bytes)).

> 
> I'm happy to run any other tests if there is something specific desired.
> 
> Note: I deleted the previous files I shared since they were bogus.

	Ah, that got me confused, I see the new files just fine.

Best Regards
	Sebastian


> 
> I'm going to start playing wire wireless next.  There's noise in the forms that it may not be working very well but its mixed in with 1200/1900AC so its hard to know how much applies to the ACS.
> 
> -- 
> Richard A. Smith