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This page [1] describes additional tuning parameters. In particular adjusting /proc/sys/kernel/sched_rt_runtime_us can be beneficial.

[1] https://access.redhat.com/documentation/en-us/red_hat_enterp...

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For lowest latency applications I void avoid using RT priorities. Better to run each core 100% with busy waiting and if you do so with RT prio you can prevent the kernel from running tasks such as vmstat leading to lockup issues. Out of the box there is currently no way to 100% isolate cores in Linux. There is some ongoing work on that: https://lwn.net/Articles/816298/

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