IPC degradation analysis

I executed following benchmark
https://github.com/goldsborough/ipc-bench.git on two different architectures i.e armv7l & riscv64. I see degradation on riscv64 IPCs like shm, mmap etc. I want to find the reason of degradation in message rate on riscv, so for that what aspects should I check? How do I start with the ipc analysis?
Could anyone please guide me on this?

Thanks