On Thu, Oct 21, 2021 at 01:16:46PM +0000, Azat.Nurgaliev@xxxxxx wrote: > Hello everyone, > > I need to turn readahead off completely in order to do my experiments. > Is there any way to turn it off completely? > > Setting /sys/block/<dev>/queue/read_ahead_kb to 0 causes readahead to become 4kb. That's entirely intentional. What experiment are you actually trying to perform?