[roywiggins]

DPI usually refers to actually poking around the contents of the packets, which in TOR are (hopefully) minimally informative. With timing attacks you just keep track of the volume.

[g-b-r]

Why is DPI still being brought up? And what was wrong in my message?

With timing you keep track of the volume and... timing, which (often) allows you to correlate the entering and exiting traffic...