[abadid]

Latency is measured from the client. In the example in the post (and more details in the paper), you see the latency tail from when clients access data that is far from them. The challenge is to make multi-home transactions no worse than regular Paxos latency. In previous systems, this required multiple rounds of communication across the homes that are involved in that transaction. In systems like PNUTS, they would disable such transactions altogether. SLOG's ability to handle such transactions with latency no worse than Paxos is a big step forward.