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network buffering / mlat stagger customisation option (#68)

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Increasing the beast-reduce flush interval will reduce network load for
aggregators by sending less but larger network packets.

mlat-client startup can take quite some time when using several
aggregators, add an ENV var so people can reduce it if they prefer.

mlathub was using beast_reduce_out to send data, this is local transfer
so using beast_reduce is not necessary. (mlat results are not high
message rate in any case)
This commit is contained in:
kx1t 2024-03-14 15:37:03 -04:00 committed by GitHub
commit 01fcc342a0
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4 changed files with 11 additions and 4 deletions
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6
README.md
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@ -203,6 +203,7 @@ The following parameters must be set (mandatory) for the container to function:
| `READSB_EXTRA_ARGS` | Optional, allows to specify extra parameters for readsb | | Unset |
| `S6_SERVICES_GRACETIME` | Optional, set to 30000 when saving traces / globe_history | | `3000` |
| `LOGLEVEL` | `verbose` (all messages), `error` (errors only), `none` (minimal) | | `verbose` |
| `MLAT_STARTUP_STAGGER` | mlat-client startup staggering for tidy logs (reduce for quicker startup) | | `15` |
`READSB_EXTRA_ARGS` just passes arguments to the commandline, you can check this file for more options for wiedehopf's readsb fork: <https://github.com/wiedehopf/readsb/blob/dev/help.h>
@ -367,8 +368,9 @@ There are many optional parameters relating to the ingestion of data and the gen
| `READSB_NET_BEAST_INPUT_PORT` | TCP Beast input listen ports | `--net-bi-port=<ports>` | `30004,30104` |
| `READSB_NET_BEAST_OUTPUT_PORT` | TCP Beast output listen ports | `--net-bo-port=<ports>` | `30005` |
| `READSB_NET_BUFFER` | TCP buffer size 64Kb \* (2^n) | `--net-buffer=<n>` | `2` (256Kb) |
| `READSB_NET_RAW_OUTPUT_INTERVAL` | TCP output flush interval in seconds (maximum interval between two network writes of accumulated data). | `--net-ro-interval=<rate>` | `0.05` |
| `READSB_NET_RAW_OUTPUT_SIZE` | TCP output flush size (maximum amount of internally buffered data before writing to network). | `--net-ro-size=<size>` | `1200` |
| `READSB_NET_RAW_OUTPUT_INTERVAL` | TCP output flush interval in seconds (maximum output buffer delay). | `--net-ro-interval=<seconds>` | `0.05` |
| `READSB_NET_RO_INTERVAL_BEAST_REDUCE` | TCP output flush interval in seconds for beast reduce outputs (maximum output buffer delay). | `--net-ro-interval-beast-reduce=<secs> | `0.12` |
| `READSB_NET_RAW_OUTPUT_SIZE` | TCP output flush size (maximum amount of internally buffered data before writing to network). | `--net-ro-size=<size>` | `1280` |
| `READSB_NET_CONNECTOR_DELAY` | Outbound re-connection delay. | `--net-connector-delay=<seconds>` | `30` |
| `READSB_NET_HEARTBEAT` | TCP heartbeat rate in seconds (0 to disable). | `--net-heartbeat=<rate>` | `35` |
| `READSB_NET_RAW_INPUT_PORT` | TCP raw input listen ports. | `--net-ri-port=<ports>` | `30001` |

2
rootfs/etc/s6-overlay/scripts/mlat-client
View file

@ -205,7 +205,7 @@ do
# stagger by 15 second so they don't all start at the same time
sleep 15 & wait $!
sleep "${MLAT_STARTUP_STAGGER:-15}" & wait $!
# ------------------------------------------------
# run this Mlat_client instance in the background:

2
rootfs/etc/s6-overlay/scripts/mlathub
View file

@ -27,7 +27,7 @@ MLATHUB_CMD+=("--mlat")
MLATHUB_CMD+=("--forward-mlat")
MLATHUB_CMD+=("--forward-mlat-sbs")
MLATHUB_CMD+=("--net-connector=localhost,30004,beast_reduce_out")
MLATHUB_CMD+=("--net-connector=localhost,30004,beast_out")
# define some more ports:
MLATHUB_CMD+=("--net-sbs-port=${MLATHUB_SBS_OUT_PORT:-31003}")

5
rootfs/etc/s6-overlay/scripts/readsb
View file

@ -207,6 +207,11 @@ if [[ -n "$READSB_NET_RAW_OUTPUT_INTERVAL" ]]; then
READSB_CMD+=("--net-ro-interval=$READSB_NET_RAW_OUTPUT_INTERVAL")
fi
# use 0.12s/120ms to reduce number of packets sent to aggregators (compared to ro-interval 50ms)
# most aggregator feed clients historically use 200ms so this is already a reduction in jitter / latency
READSB_CMD+=("--net-ro-interval-beast-reduce=${READSB_NET_RO_INTERVAL_BEAST_REDUCE:-0.12}")
# Handle "--net-ri-port=<ports>"
if [[ -n "$READSB_NET_RAW_OUTPUT_PORT" ]]; then
READSB_CMD+=("--net-ro-port=$READSB_NET_RAW_OUTPUT_PORT")