Swapped my RPi3 for a pi0W and destroyed my range! [SOLVED]

TomMuc · September 28, 2017, 12:06pm

both have again nearly the same output: 260 aircrafts/190 with position/1,300 messages per second

this time pi zero runs on fa sd-card image 3.5.1

terminal now says:

pi@piaware:~$ cat /proc/cpuinfo
processor       : 0
model name      : ARMv6-compatible processor rev 7 (v6l)
BogoMIPS        : 997.08
Features        : half thumb fastmult vfp edsp java tls
CPU implementer : 0x41
CPU architecture: 7
CPU variant     : 0x0
CPU part        : 0xb76
CPU revision    : 7

Hardware        : BCM2708
Revision        : 9000c1
Serial          : 000000009015d1xx


pi@piaware:~$ uname -a
Linux piaware 4.4.50+ #970 Mon Feb 20 19:12:50 GMT 2017 armv6l GNU/Linux

keithma · September 28, 2017, 12:47pm

I managed to do this while working. It’s running but I couldn’t get up into the loft easily to set it up there. However, I can tell straight away that it’s rubbish, exactly the same as before.

pi@test-adsb:~ $ uname -a
Linux test-adsb 4.9.35+ #1014 Fri Jun 30 14:34:49 BST 2017 armv6l GNU/Linux


pi@test-adsb:~ $ cat /proc/cpuinfo
processor	: 0
model name	: ARMv6-compatible processor rev 7 (v6l)
BogoMIPS	: 997.08
Features	: half thumb fastmult vfp edsp java tls 
CPU implementer	: 0x41
CPU architecture: 7
CPU variant	: 0x0
CPU part	: 0xb76
CPU revision	: 7

Hardware	: BCM2835
Revision	: 9000c1
Serial		: 00000000ea671848
pi@test-adsb:~ $

TomMuc · September 28, 2017, 12:59pm

you both could try david bakers idea and switch off malt - and see if just ads-b works on zero like on pi3

and you both could do a scan if there is too much noise around your site Filter not producing desired result - #11 by obj

sorry - but i have no additional ideas - and all what i could test on my side i did and ever got the same result: no difference between zero and pi2 at least at my site …

abcd567 · September 28, 2017, 1:16pm

If you are doing a fresh install, in addition to thread Bake a Pi, the thread TWEAKS will also be helpful.

keithma · September 28, 2017, 1:25pm

I tried that previously and it made no difference (removing MLAT)

I don’t like being beaten, I’ll see if I can grab another Zero and test this. I have a dozen Pis dotted around the house so I’ll try and move them around to free one up but that won’t be happening for a couple of weeks as I have a lot going on at the moment.

@abcd567 Thanks but for a basic test, none of those are really needed. I still had the gain figure on record from my last testing so I just used that and all the other stuff there is just for making it look pretty.

TomMuc · September 28, 2017, 1:31pm

i ordered a second pi zero too - so mabe next time we all have inverse results

abcd567 · September 28, 2017, 1:34pm

@keithma
For installation of dump1090-mutability and some data feeders on fresh install of Raspbian STRETCH, you will need workarounds shown here:

[Url]https://discussions.flightaware.com/t/when-is-stretch-coming-to-piaware-sd-card-image-version/25990/9[/url]

keithma · September 28, 2017, 1:48pm

Thanks, that’s good to know.

However for this rebuild I used Jessie as that’s what I was using before and I wanted to be as consistent as possible.

TomMuc · September 28, 2017, 3:29pm

i’ve also been desperate sometimes this way

and pi3 or pi zero - i would give a chep lna a try: http://www.ebay.com.au/itm/0-1-2000MHz-RF-Wideband-Amplifier-30dB-Low-noise-Broadband-Amplifier-LNA-Durable-/253125365003?hash=item3aef728d0b:g:wCoAAOSw3NlZp32a

obj · September 28, 2017, 4:54pm

Can those having problems try an unmodified piaware sdcard image on a spare sdcard and see if that helps?
I would like to rule out firmware / kernel problems.

TomMuc · September 28, 2017, 5:01pm

this is what i did today - downloaded fa 3.5.1 image → setup wifi+ssh+feederid → swapped one of my two rp2 behind the splitter to a pi zero w with the fresh fa image. result anything was fine and i got the same numbers the pi2 delivers. i asked them to do ‘cat /proc/cpuinfo’ - and what i can see they have the exact pi zero w hardware i have. see above …

edit: wrong! they have BCM2835 while i have BCM2708

but seems to be the same soc - just different naming based on ram. strange - but could this be the reason for different behavior and does this different naming lead to install different kernel modules???

obj · September 28, 2017, 5:42pm

This is exactly why I’d like the problem systems to try a standard sdcard image.

TomMuc · September 28, 2017, 5:55pm

yes now with me you have one zero (BCM2708) that works perfect with your image

TomMuc · September 28, 2017, 6:17pm

moreover - did you see - that mine - with raspbien stretch image gives different output than with fa-sdcard:

raspbian stretch:

pi@RaspPiZero:~ $ uname -a
Linux RaspPiZero 4.9.41+ #1023 Tue Aug 8 15:47:12 BST 2017 armv6l GNU/Linux

pi@RaspPiZero:~ $ cat /proc/cpuinfo
processor       : 0
model name      : ARMv6-compatible processor rev 7 (v6l)
BogoMIPS        : 697.95
Features        : half thumb fastmult vfp edsp java tls
CPU implementer : 0x41
CPU architecture: 7
CPU variant     : 0x0
CPU part        : 0xb76
CPU revision    : 7

Hardware        : BCM2835
Revision        : 9000c1
Serial          : 000000009015d1xx

versus

fa sd-card 3.5.1

pi@piaware:~$ uname -a
Linux piaware 4.4.50+ #970 Mon Feb 20 19:12:50 GMT 2017 armv6l GNU/Linux

pi@piaware:~$ cat /proc/cpuinfo
processor       : 0
model name      : ARMv6-compatible processor rev 7 (v6l)
BogoMIPS        : 997.08
Features        : half thumb fastmult vfp edsp java tls
CPU implementer : 0x41
CPU architecture: 7
CPU variant     : 0x0
CPU part        : 0xb76
CPU revision    : 7

Hardware        : BCM2708
Revision        : 9000c1
Serial          : 000000009015d1xx

obj · September 28, 2017, 6:53pm

Yes, I saw that output, that is why I want to see what happens with a known sdcard image on the problem systems.

Ant73 · September 29, 2017, 6:33am

ok.

I did a quick test using the SD img method and the results seemed a bit better in terms of range (still not quite the same as the RPi3) and the msg rate was about half.

It was only a quick test after work and before I go out overnight. I didn’t even have ssh or xrdp set up.

So, it might be a bit better but still not quite the same it seems.

I really need 2 dongles and a splitter so I can just leave them both running.

zero Vs RPi3

TomMuc · September 29, 2017, 2:53pm

second zero w arrived - slightly different soc naming - here is a picture - test within next 30 minutes
edit: works again exactly as the pi2/3 - can’t see the slightest downside using zero w

**raspbian stretch image with dump1090-mutability**
pi@RaspPiZero:~ $ uname -a
Linux RaspPiZero 4.9.41+ #1023 Tue Aug 8 15:47:12 BST 2017 armv6l GNU/Linux
pi@RaspPiZero:~ $ cat /proc/cpuinfo
processor       : 0
model name      : ARMv6-compatible processor rev 7 (v6l)
BogoMIPS        : 697.95
Features        : half thumb fastmult vfp edsp java tls
CPU implementer : 0x41
CPU architecture: 7
CPU variant     : 0x0
CPU part        : 0xb76
CPU revision    : 7

Hardware        : BCM2835
Revision        : 9000c1
Serial          : 00000000d14236xx


**raspbian jessie image with dump1090-mutability**
pi@RaspPiADSB2:~ $ uname -a
Linux RaspPiADSB2 4.4.50+ #970 Mon Feb 20 19:12:50 GMT 2017 armv6l GNU/Linux
pi@RaspPiADSB2:~ $ cat /proc/cpuinfo
processor       : 0
model name      : ARMv6-compatible processor rev 7 (v6l)
BogoMIPS        : 997.08
Features        : half thumb fastmult vfp edsp java tls
CPU implementer : 0x41
CPU architecture: 7
CPU variant     : 0x0
CPU part        : 0xb76
CPU revision    : 7

Hardware        : BCM2708
Revision        : 9000c1
Serial          : 00000000d14236xx


**top while 270 aircrafts - 200 aircrafts with position - mlat = on - 1,370 messages/sec**
pi@RaspPiADSB2:~ $ top
top - 17:36:29 up 13 min,  1 user,  load average: 1.55, 1.44, 0.91
Tasks:  99 total,   3 running,  96 sleeping,   0 stopped,   0 zombie
%Cpu(s): 59.4 us,  9.6 sy,  0.0 ni, 27.4 id,  0.0 wa,  0.0 hi,  3.6 si,  0.0 st
KiB Mem:    445084 total,   135752 used,   309332 free,    12780 buffers
KiB Swap:   102396 total,        0 used,   102396 free.    67836 cached Mem

  PID USER      PR  NI    VIRT    RES    SHR S %CPU %MEM     TIME+ COMMAND
  708 dump1090  15  -5   29844  11676   2072 R 45.7  2.6   6:11.86 dump1090-mutabi
  810 piaware   20   0   13088   9732   6164 S 14.9  2.2   2:00.83 fa-mlat-client
  677 piaware   20   0   23844   9432   5360 S  4.2  2.1   0:42.05 piaware
  779 piaware   20   0    3132   2392   1808 S  3.9  0.5   0:30.62 faup1090
  841 pi        20   0    5100   2504   2144 R  1.3  0.6   0:00.15 top
	6 root      20   0       0      0      0 S  0.6  0.0   0:03.32 kworker/u2:0
	3 root      20   0       0      0      0 R  0.3  0.0   0:02.24 ksoftirqd/0
   60 root     -51   0       0      0      0 S  0.3  0.0   0:03.43 irq/86-mmc1
  185 root      20   0       0      0      0 S  0.3  0.0   0:01.87 brcmf_wdog/mmc1
  728 www-data  20   0    8948   4872   3464 S  0.3  1.1   0:01.87 lighttpd
  818 pi        20   0   11472   3772   3140 S  0.3  0.8   0:00.05 sshd
	1 root      20   0   22856   3956   2784 S  0.0  0.9   0:04.50 systemd
	2 root      20   0       0      0      0 S  0.0  0.0   0:00.00 kthreadd
	5 root       0 -20       0      0      0 S  0.0  0.0   0:00.00 kworker/0:0H
	7 root      20   0       0      0      0 S  0.0  0.0   0:00.01 kdevtmpfs
	8 root       0 -20       0      0      0 S  0.0  0.0   0:00.00 netns
	9 root       0 -20       0      0      0 S  0.0  0.0   0:00.00 perf
   10 root      20   0       0      0      0 S  0.0  0.0   0:00.00 khungtaskd
   11 root       0 -20       0      0      0 S  0.0  0.0   0:00.00 writeback
   12 root       0 -20       0      0      0 S  0.0  0.0   0:00.00 crypto
   13 root       0 -20       0      0      0 S  0.0  0.0   0:00.00 bioset
   14 root       0 -20       0      0      0 S  0.0  0.0   0:00.00 kblockd
   15 root      20   0       0      0      0 S  0.0  0.0   0:00.19 kworker/0:1
   16 root       0 -20       0      0      0 S  0.0  0.0   0:00.00 rpciod
   17 root      20   0       0      0      0 S  0.0  0.0   0:00.00 kswapd0
   18 root      20   0       0      0      0 S  0.0  0.0   0:00.00 fsnotify_mark
   19 root       0 -20       0      0      0 S  0.0  0.0   0:00.00 nfsiod

Obadiah3244 · September 29, 2017, 5:12pm

FWIW,

At 1pm local time here at KFLL, my Pi0 W is running with a CPU load of 54% while my Pi3 is running with a 9% load.

Both are operating with the Piaware 3.5.1 image only, and both have MLAT enabled.

TomMuc · September 29, 2017, 5:51pm

the question was does the zero deliver less range/aircrafts/messages than pi2/3 - so adding these numbers would improve the message of your post instantly

obj · September 29, 2017, 6:50pm

Hm, running out of ideas to explain the difference then…

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Swapped my RPi3 for a pi0W and destroyed my range! [SOLVED]

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