Am 02.08.2018 um 17:57 schrieb Bean Huo (beanhuo): >>>> I guess you're doing buffered IO, have you try to use direct IO? >>>> >>> Direct I/O is another case, it is true that will bypass readahead. >>> But I want to disable readahead with page cache. >> >> don't get me wrong but when you state "I am newbie on ext4" this all sounds >> like "having solution, seeking for problem" > > No solution, I only want to disable ext4 readahead with keeping page cache. > I am curious about that flash based SDD/UFS/eMMC already has readahead in the FW, what is benefit of readahead in the FS under this condition? you still miss to point out the *problem* you are trying to solve and "i want" is no reasoning - as newbie you really should trust the developers that they know what they are doing and not play around with something for no good reason
