Legato 21.05 and CONFIG_PREEMPT_RT

Hello,

I found that latency of GPIO interrupt handlers is big and unstable.
On other ARM Cortex-A7 systems, for example i.MX6ULL, I used CONFIG_PREEMPT_RT enabled in kernel configuration to get interrupt latency stable in range 5-10 us.
Is it possible to use this option with Legato and WP76/77 modems? Any experience? Or other way to struggle with latency should be used?

With best regards, Sergey.

are you using the GPIO legato API in legato application?
How about using the GPIO interrupt in kernel driver layer and see if there is improvement?

You can also see if this helps to change the priority of irq: