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  7. High filtered messages rate, low message count

High filtered messages rate, low message count

6 years 5 months ago #460 by gidig
High filtered messages rate, low message count was created by gidig
I've read that opensky is applying advanced filtering algorithms but what's wrong here with this station's high amount of filtered messages?

What can I do to improve the performance of the station.

Config is:
Raspi 3, Raspian Stretch, dump1090-fa, FA Prostick and FA Prostick Antenna, Gain @43.9 (max messages/positions/AC)
A second Raspi3 with same SW but with an RTL-SDR and LNA has 0% filtering and nice message rate (but also no Mode-A/C messages).

Jun 11 11:50:21 raspi3 openskyd-dump1090[8500]: - 4501147 [ 91%] filtered (681.99 /s, 445.10 /s)
Jun 11 11:50:21 raspi3 openskyd-dump1090[8500]: - 2874482 [ 58%] Mode-S filtered (435.53 /s, 423.66 /s)
Jun 11 11:50:21 raspi3 openskyd-dump1090[8500]: - 4929081 unsynchronized frames

journalctl -b 0 -u opensky-feeder
Jun 11 11:50:21 raspi3 openskyd-dump1090[8500]: Statistics
Jun 11 11:50:21 raspi3 openskyd-dump1090[8500]:  - started on Mon Jun 11 10:00:21 2018
Jun 11 11:50:21 raspi3 openskyd-dump1090[8500]:  - running since   0d, 01h:50m:00s
Jun 11 11:50:21 raspi3 openskyd-dump1090[8500]:  Receiver
Jun 11 11:50:21 raspi3 openskyd-dump1090[8500]:  -                     4929081 frames received (746.83 /s, 504.48 /s)
Jun 11 11:50:21 raspi3 openskyd-dump1090[8500]:  -                     1626665 [ 33%] Mode-A/C (246.46 /s, 21.44 /s)
Jun 11 11:50:21 raspi3 openskyd-dump1090[8500]:  -                     2345461 [ 48%] Mode-S Short (355.37 /s, 346.69 /s)
Jun 11 11:50:21 raspi3 openskyd-dump1090[8500]:  -                      956955 [ 19%] Mode-S Long (144.99 /s, 136.35 /s)
Jun 11 11:50:21 raspi3 openskyd-dump1090[8500]:    -                      730233 [ 22%] type 0 (110.64 /s, 106.31 /s)
Jun 11 11:50:21 raspi3 openskyd-dump1090[8500]:    -                      209637 [  6%] type 4 (31.76 /s, 31.96 /s)
Jun 11 11:50:21 raspi3 openskyd-dump1090[8500]:    -                       28803 [  1%] type 5 (4.36 /s, 3.77 /s)
Jun 11 11:50:21 raspi3 openskyd-dump1090[8500]:    -                     1376788 [ 42%] type 11 (208.60 /s, 204.65 /s)
Jun 11 11:50:21 raspi3 openskyd-dump1090[8500]:    -                       35585 [  1%] type 16 (5.39 /s, 4.68 /s)
Jun 11 11:50:21 raspi3 openskyd-dump1090[8500]:    -                      426195 [ 13%] type 17 (64.58 /s, 59.16 /s)
Jun 11 11:50:21 raspi3 openskyd-dump1090[8500]:    -                        1739 [  0%] type 18 (0.26 /s, 0.22 /s)
Jun 11 11:50:21 raspi3 openskyd-dump1090[8500]:    -                      372563 [ 11%] type 20 (56.45 /s, 54.41 /s)
Jun 11 11:50:21 raspi3 openskyd-dump1090[8500]:    -                      120806 [  4%] type 21 (18.30 /s, 17.87 /s)
Jun 11 11:50:21 raspi3 openskyd-dump1090[8500]:    -                          67 [  0%] type 24 (0.01 /s, 0.01 /s)
Jun 11 11:50:21 raspi3 openskyd-dump1090[8500]:  -                           0 [  0%] status (0.00 /s, 0.00 /s)
Jun 11 11:50:21 raspi3 openskyd-dump1090[8500]:  -                           0 [  0%] unknown (0.00 /s, 0.00 /s)
Jun 11 11:50:21 raspi3 openskyd-dump1090[8500]:  -                     4501147 [ 91%] filtered (681.99 /s, 445.10 /s)
Jun 11 11:50:21 raspi3 openskyd-dump1090[8500]:  -                     2874482 [ 58%] Mode-S filtered (435.53 /s, 423.66 /s)
Jun 11 11:50:21 raspi3 openskyd-dump1090[8500]:  -                     4929081 unsynchronized frames
Jun 11 11:50:21 raspi3 openskyd-dump1090[8500]:  Buffer
Jun 11 11:50:21 raspi3 openskyd-dump1090[8500]:  -                           0 queued messages (current)
Jun 11 11:50:21 raspi3 openskyd-dump1090[8500]:  -                          22 queued messages (max)
Jun 11 11:50:21 raspi3 openskyd-dump1090[8500]:  -                           0 discarded messages (current)
Jun 11 11:50:21 raspi3 openskyd-dump1090[8500]:  -                           0 discarded messages (overall)
Jun 11 11:50:21 raspi3 openskyd-dump1090[8500]:  -                           0 discarded messages (in worst overflow situation)
Jun 11 11:50:21 raspi3 openskyd-dump1090[8500]:  -                         199 messages in pool (Usage 0.00%)
Jun 11 11:50:21 raspi3 openskyd-dump1090[8500]:  -                           0 dynamic pools (current)
Jun 11 11:50:21 raspi3 openskyd-dump1090[8500]:  -                           0 dynamic pools (overall)
Jun 11 11:50:21 raspi3 openskyd-dump1090[8500]:  -                           0 dynamic pools (max)
Jun 11 11:50:21 raspi3 openskyd-dump1090[8500]:  -                           1 flushes
Jun 11 11:50:21 raspi3 openskyd-dump1090[8500]:  -                           0 uncollected dynamic pools
Jun 11 11:50:21 raspi3 openskyd-dump1090[8500]:  -                           0 Garbage Collector runs
Jun 11 11:50:21 raspi3 openskyd-dump1090[8500]:  Network
Jun 11 11:50:21 raspi3 openskyd-dump1090[8500]:  -                             currently online
Jun 11 11:50:21 raspi3 openskyd-dump1090[8500]:  -                        6600 [100%] seconds online (overall)
Jun 11 11:50:21 raspi3 openskyd-dump1090[8500]:  -                           0 disconnections
Jun 11 11:50:21 raspi3 openskyd-dump1090[8500]:  -                           1 connection attempts
Jun 11 11:50:21 raspi3 openskyd-dump1090[8500]:  -                     9877911 bytes sent (1496.65/s)
Jun 11 11:50:21 raspi3 openskyd-dump1090[8500]:  -                           8 bytes received (0.00/s)

the other stats block in the log look similar (for filtering values).
6 years 5 months ago - 6 years 5 months ago #461 by engel
Replied by engel on topic High filtered messages rate, low message count
Hi gidig,
the stats are a bit confusing, I should maybe refactor them in future versions.
About your question: we either only forward DF 17+18 or all Mode-S messages. This is individually configured by the server when connecting.
Obviously, we only request DF 17+18 from your station: df17+df18=all-filtered: 426195+1739=4929081-4501147.

I don't know what should be the default right now (I thought we request all messages from all receivers meanwhile), so I'll have a talk with the ones responsible because it might point out a misconfiguration of the server.
6 years 5 months ago #462 by gidig
Replied by gidig on topic High filtered messages rate, low message count
Can I do something from my side?
6 years 5 months ago #463 by engel
Replied by engel on topic High filtered messages rate, low message count
Not at the moment, thanks.
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