Where in this trace is there a latency spike? I could not see one.

Hi John,

For the 5.2.0-rt1 trace data set I believe the latency is with
cyclicte-1935 at the end. If I just look at the "cyclicte-1935 ...
finish_task_switch <-__schedule" lines then the delta-t's are mostly
around 200us except for the last delta-t which is >5000us
cyclicte-1935    1d...3.. 84243668us : uao_thread_switch <-__switch_to
cyclicte-1935    1d...3.. 84249436us : finish_task_switch <-__schedule

The actual cyclictest output is shown below:
# ./cyclictest -S -m -n -p 99 -i 200 -h 700 -f -b 5000
# /dev/cpu_dma_latency set to 0us
INFO: debugfs mountpoint: /sys/kernel/debug/tracing/
policy: fifo: loadavg: 5.55 1.84 0.66 11/136 1941

T: 0 ( 1934) P:99 I:200 C: 411188 Min:     30 Act:   30 Avg:   93 Max:     652
T: 1 ( 1935) P:99 I:200 C: 382925 Min:     47 Act: 5713 Avg:  123 Max:    5713
T: 2 ( 1936) P:99 I:200 C: 395011 Min:     40 Act:   40 Avg:  117 Max:     561
T: 3 ( 1937) P:99 I:200 C: 392379 Min:     36 Act:   36 Avg:  109 Max:     636

thanks,
Paul