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+--- Thread: LM4 (i.MX28) SW: 20240426 lagging (/showthread.php?tid=6323)
LM4 (i.MX28) SW: 20240426 lagging - puntukas - 24.02.2026
Recently updated LM4 to SQ20240426 and the system became noticeably laggy and almost UNUSABLE.
KNX event-based scripts execute with several seconds delay.
Version: 20240426
CPU/IO: 0.28 0.45 0.64
Memory: 35%
KNX/TP: OK
CPU sometimes peaks to 1.5 without visible load.
There are 2 Modbus devices configured.
Polling was 10s, now increased to 45s, but lag still present.
Stopping several Lua scripts did not change behaviour.
Previous firmware worked perfectly on the same hardware.
Is there any known issue with KNX stack, scheduler or IO handling in SQ20240426?
Any ideas what to do?
thanks!
RE: LM4 (i.MX28) SW: 20240426 lagging - Daniel - 24.02.2026
Noone never reported anything. SD probably giving sign of death.
RE: LM4 (i.MX28) SW: 20240426 lagging - admin - 24.02.2026
Install System load app and see which process is consuming system resources. You've asked about HA integration, is it the same LM? Maybe the problem is connected.
RE: LM4 (i.MX28) SW: 20240426 lagging - puntukas - 24.02.2026
(24.02.2026, 13:33)admin Wrote: Install System load app and see which process is consuming system resources. You've asked about HA integration, is it the same LM? Maybe the problem is connected.
HA is a separate machine only for visuals. What changed - I've added dozen of DSTs to groupread function thru a tag.
System monitor shows highest ~20% at peak:
/usr/bin/eibd-e 1.1.201 -q 100 -L 1 -Q 0 -E xx.xx.xx.xx -T -f eth0 -D -R -S224.0.23.12 -F n,n,n,n,0,0 tpuarts:/dev/ttyAPP4
resident lua - ~3% each at maximum.
Thank you!
RE: LM4 (i.MX28) SW: 20240426 lagging - admin - 24.02.2026
You can use Group monitor app to see the sent telegrams and if there are any repeats.
RE: LM4 (i.MX28) SW: 20240426 lagging - puntukas - 24.02.2026
Thank you, I will check.
Is it possible to understand what script is exactly by a script number here:
942 resident 7lua/lib/genohm-scada/core/scripting-resident.lua 7 3.69% 3.89MB
940 resident 5lua/lib/genohm-scada/core/scripting-resident.lua 5
RE: LM4 (i.MX28) SW: 20240426 lagging - admin - 24.02.2026
5 and 7 are script ids, editor URL is http://LM_IP/scada-main/main/editor?id=5