Jetson orin AGX PREEMPT-RT RT-test

[bin.zhou918]

hello,
I installed the real-time patch on the Jetson Orin AGX 64 and conducted real-time performance tests using cyclictest. However, the test result are much worse than those in the non-real-time scenario. Did i make some incorrect settings somewhere.
uname -a
Linux ubuntu 5.15.148-rt-tegra #1 SMP PREEMPT_RT Mon Oct 14 17:05:40 PDT 2024 aarch64 aarch64 aarch64 GNU/Linux
sonoscape@ubuntu:~$ sudo cyclictest -t 8 -D 2h --policy=fifo
defaulting realtime priority to 9

/dev/cpu_dma_latency set to 0us

policy: fifo: loadavg: 5.78 5.07 4.16 4/1172 5198

T: 0 ( 5191) P: 9 I:1000 C: 14948 Min: 5 Act: 28 Avg: 17 Max: 1361
T: 1 ( 5192) P: 9 I:1500 C: 9965 Min: 7 Act: 30 Avg: 23 Max: 1661
T: 2 ( 5193) P: 9 I:2000 C: 7474 Min: 7 Act: 25 Avg: 18 Max: 1074
T: 3 ( 5194) P: 9 I:2500 C: 5978 Min: 7 Act: 14 Avg: 20 Max: 3192
T: 4 ( 5195) P: 9 I:3000 C: 4979 Min: 7 Act: 22 Avg: 20 Max: 6221
T: 5 ( 5196) P: 9 I:3500 C: 4271 Min: 7 Act: 22 Avg: 18 Max: 1429
T: 6 ( 5197) P: 9 I:4000 C: 3737 Min: 7 Act: 27 Avg: 18 Max: 1230
T: 7 ( 5198) P: 9 I:4500 C: 3321 Min: 7 Act: 13 Avg: 31 Max: 2041

[DaneLLL]

Hi,
Please try the steps for comparison:

1. Open one console and run

$ sudo jetson_clocks
$ stress --cpu 12 --io 12 --vm 12 // 12 is number of CPU cores. Please change it per the platform

2. Open the other console and run cyclictest
3. Compare MAX latency between RT and non-RT kernel.