On Fri, Feb 9, 2018 at 8:42 AM, Robert Nelson <[email protected]> wrote: > On Fri, Feb 9, 2018 at 5:00 AM, 'NetworkSorcerer' via BeagleBoard > <[email protected]> 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/ -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CAOCHtYgk2DBj_gRT9oUZE79rT1uFMW_opPordsLnTGb%2Bd7MXyQ%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
