>"Imagine a world where data layout doesn’t matter, where apps are optimized for sub-millisecond storage, where 100 byte I/Os are faster and just as efficient as 8KB I/Os.
with latency not being absolute 0, 100bytes I/O will always be less efficient the 8K I/Os. For example, with 300Mb/s and 0.01ms latency the throughput would be 10M/s vs 220M/s.
"100bytes I/O will always be less efficient the 8K I/Os"
Not if only 200 bytes of that 8K are relevant. It depends on the rpc overhead, but the small io's may be more efficient. Which is why you see them researching changes to the networking stack.
"300Mb/s and 0.01ms latency the throughput would be 10M/s vs 220M/s."
When you write numbers on a napkin this is true. When you're talking about real systems that are both concurrent and scheduled in quantized slices you'll see much more complex behavior.
with latency not being absolute 0, 100bytes I/O will always be less efficient the 8K I/Os. For example, with 300Mb/s and 0.01ms latency the throughput would be 10M/s vs 220M/s.