Re:Going Big with TCP Packets
by jsnell on Wednesday February 16, 2022 @09:42AM
(#30360544)
Kernel bypass is not a panacea. Even with a totally userspace networking stack, there will be a lot of per-packet rather than per-byte processing, and often packets from different sources will be sufficiently interleaved that you can't even do any kind of useful batching fastpath .
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taking cpu-cores out of normal scheduling, and dedicating them for just packet-forwarding etc. is the first step. not sure how popular ddio is outside of intel ecosystem, but shunting packets between nic and cpu-cache (to and from) is very useful for such workloads imho.