NMIS might be a bit more popular than DPDK. We know about 1 link to it since March 2021 and only 1 link to DPDK. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Regarding explicit gear suggestion, for the dpdk dataplane, basically any recent pc could do... One thing to note well, check the dpdk.org for hardware compatibility... it's very picky on nic and cpu.... My personal suggestion here is aliexpress, search for "pfsense 10gbps" and friends and go for intel nics and i7 cpu to have something really usable.... :). Source: over 2 years ago
I've been using NMIS for years. The best tool is the one you setup, maintain list of what to be monitored and it emails you when something is wrong. I rarely need to login because I get an email telling me what is wrong and a script that keeps my list of nodes up-to-date. Source: about 2 years ago
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