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by benlwalker
1061 days ago
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At 200+ Gbps, the copy from LLC where the packet landed to the userspace buffer dominates the performance profiles on most systems. The TCP processing isn't bad and the expensive parts can often be offloaded. I'd contend that this data copy on the TCP recv path is one of the most important performance issues to solve for the entire industry right now. DDIO let us kick the can way down the road, but it seems like the network speeds have outpaced the CPU speeds so much that it can't save us for much longer. |
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