[dpdk-users] Optimal number of elements in mempool n = (2^q - 1) vs examples, what is the right thing to do?

["Lazarenko, Vlad (WorldQuant)" <Vlad.Lazarenko@worldquant.com>]

Hello,

I'm new to DPDK and have noticed that documentation for rte_mempool_create states that the optimal size for a number of elements in the pool is n = (2^q-1). But in many examples it is simply set to 2^q (multi_process/simple_mp/main.c uses 2014, for example). This is a bit confusing. Is 2^q - 1 really the optimal number but examples don't use it, or maybe the documentation for the mempool is wrong, or...? If anyone could shed some light on this that'd be helpful.

Thanks,
Vlad



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