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Those are really useful numbers--I think a lot of it can be chalked up to virtualization, but we should definitely explore more around IRQ pinning for queues. Any good starting points / reading, are you mostly using taskset?

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Taskset is fine for the process pinning. Don't forget about hyperthreading, you want to try to keep each thread on each hardware thread. IRQ pinning, see an example script I have:

http://chrisgoffinet.com/pin_network.sh

This will set queues 0-7 to specific smp affinity slots.

Why do you guys use both memcache and Redis ? Redis also has LRU cache functionality.

Because in-house we have a custom version of memcache. We rewrote memcache's slab allocator, and for some use cases, is better at memory efficiency than Redis.

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