is it ? those things are trivial enough to be entirely bandwidth limited. total_amount is 4 byte, passenger_count is 1 and those are tightly packed in a column

is it ? those things are trivial enough to be entirely bandwidth limited. total_amount is 4 byte, passenger_count is 1 and those are tightly packed in a column layout. streaming through that in 150ms is almost within the reach of a single normal chip with dual channel DDR3 ram. Of course, not quite, and that's discounting the (small) sync overhead but still, no need to shell out 4 big servers, overpriced phi chips and fancy wide bus memory.