Which USB read pattern is more efficient: Multiple reads or one big read?

Question

Which one is more efficient (= fastest) implementation for transferring data through USB and writing it on memory for further processes:

1. reading a little data from USB and write on memory repeatedly multiple times.
2. reading one huge data from USB and write it on memory.

Answer 1

In my Experience it's better to read a lot of data from USB in order to reduce latency from OS. Long time ago I was writing an application which had to write data to a device using USB in raw mode. The device was using a 128 bytes array to store data from the other part (Windows in my case). When I increased tha data size on the the device part, allocating 1 MB of space, I got a great increase of performance