On Fri, Feb 9, 2018 at 8:42 AM, Robert Nelson <robertcnel...@gmail.com> wrote:
> On Fri, Feb 9, 2018 at 5:00 AM, 'NetworkSorcerer' via BeagleBoard
> <beagleboard@googlegroups.com> wrote:
>> Hi Folks
>>
>> Boy this is a doozy...
>>
>> I've been trying to set up a Beaglebone Black as a lightweight autonomous
>> networking appliance to monitor and analyse connection performance at remote
>> locations, the method is fairly straightforward. I'm using a simple bash
>> script to run speedtest-cli and then pipe the output into an email with
>> mailutils/ssmtp and to that end, everything performs flawlessly, except that
>> the actual results from speedtest-cli are complete mince.
>> We've ruled out the basics at this point, iperf is showing the NIC is
>> capable of transfer rates of around 90mbps on a 100mbps link which is
>> optimal when one takes into account TCP overheads etc, we've run a few
>> different incarnations of the same type of test under different languages
>> such as C++ but to no avail, the device still reports erroneous results.
>> We've tried running under a few different Kernels both old and more recent,
>> we've tried running under python 2.7 and 3.1
>>
>> Some example outputs (all wired on a 100/1000 syncronous fibre,
>> uncomplicated flat network with <10 devices, 2 users):
>>
>> From a debian VM on a Laptop with plenty of poke
>>
>> root@test-VirtualBox:/etc/ssmtp# ./speedtest-cli --server 226
>> Retrieving speedtest.net configuration...
>> Testing from [insert ISP here] (xxx.xxx.xxx.xxx)...
>> Retrieving speedtest.net server list...
>> Selecting best server based on ping...
>> Hosted by Structured Communications (London) [2.56 km]: 30.928 ms
>> Testing download
>> speed................................................................................
>> Download: 31.86 Mbit/s
>> Testing upload
>> speed................................................................................................
>> Upload: 52.86 Mbit/s
>>
>> This result, although not indicative of 100/1000 performance is considered
>> optimal as such tests are not designed for synchronous services and often
>> report silly results, the key factor is that it executed swiftly (10-15ish
>> seconds) and is in line with what we would expect from running its online
>> cousin in flash/html5.
>>
>> Beagleboard output
>>
>> debian@beaglebone:~/speedtest$ ./speedtest-cli
>> Retrieving speedtest.net configuration...
>> Testing from [insert ISP here] (xxx.xxx.xxx.xxx)...
>> Retrieving speedtest.net server list...
>> Selecting best server based on ping...
>> Hosted by Cybersmart Pty Ltd (London) [2.56 km]: 2548.699 ms
>> Testing download
>> speed................................................................................
>> Download: 3.18 Mbit/s
>> Testing upload
>> speed................................................................................................
>> Upload: 3.37 Mbit/s
>>
>> The execution time on the beagleboard is on the order of a couple of
>> minutes, with max CPU spikes being noted during the process, mostly from
>> python. Take particular note of the ludicrous ping and strange Tx/Rx
>> numbers. In mentioning pings too, we've noted that while reported latency
>> from ICMP packets is nominal, again the execution is sluggish, running
>> significantly slower than even the oldest most hacked up x86 box we have
>> kicking about. Some discrepancy is expected due to the differing
>> architectures but surely not so noticeable??
>>
>> A network trace during the test shows no significant anomalies in packet
>> transmission (too large to post) and we have reproduced the issue on a
>> couple of units reducing the likelihood of it being a hardware fault,
>> everything seems to point to some oddity in how the device is handling the
>> job and we cant for the life of us put a finger on it.
>>
>> Any insight from those who better understand the nuts and bolts of these wee
>> beasties would be hugely appreciated, we can work around this by using iperf
>> if we have to but would prefer to be able to deploy these as standalone
>> units (iperf would require us to run a box on our end long term).
>>
>> Current Kernel - 4.14.17-ti-r32
>
> Smells like your switch/cable to the BBB:
>
> This BBB: is connected to a 10/100 switch <-> 10/100/1000 switch <->
> router <-> 1000 / 20 Cable
>
> debian@bborg-stretch-v8-18:~$ uname -r
> 4.14.16-ti-r30
>
> debian@bborg-stretch-v8-18:~$ speedtest-cli
> Retrieving speedtest.net configuration...
> Testing from Midcontinent Communications (<ip>)...
> Retrieving speedtest.net server list...
> Selecting best server based on ping...
> Hosted by Midco (Grand Forks, ND) [10.60 km]: 17.254 ms
> Testing download
> speed................................................................................
> Download: 86.16 Mbit/s
> Testing upload 
> speed....................................................................................................
> Upload: 20.83 Mbit/s
>
>
> on an x86 host, connected to the 10/100/1000 switch:
>
> voodoo@nuc-git:~$ uname -r
> 4.9.0-5-amd64
> (Qualcomm Atheros AR816x/AR817x Ethernet) (had better when it was a
> intel nuc with intel e1000)
>
> voodoo@nuc-git:~$ speedtest-cli
> Retrieving speedtest.net configuration...
> Testing from Midcontinent Communications (<ip>)...
> Retrieving speedtest.net server list...
> Selecting best server based on ping...
> Hosted by Midco (Fargo, ND) [113.89 km]: 11.954 ms
> Testing download
> speed................................................................................
> Download: 766.46 Mbit/s
> Testing upload 
> speed....................................................................................................
> Upload: 20.98 Mbit/s

Opps, just noticed it switch the server on my x86, ran again to have a
more apples/apples..

Retrieving speedtest.net configuration...
Testing from Midcontinent Communications (<ip>)...
Retrieving speedtest.net server list...
Selecting best server based on ping...
Hosted by Midco (Grand Forks, ND) [10.60 km]: 10.506 ms
Testing download
speed................................................................................
Download: 625.15 Mbit/s
Testing upload 
speed....................................................................................................
Upload: 20.86 Mbit/s

(the fargo office is better in our area, even thou it's 100Km away)

Regards,

Robert Nelson
https://rcn-ee.com/

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