> >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 Please focus on my question: how to disable readahead What's problem I found. I am not sure it is related to readahead. I need to validate between conditions. If you know how to disable readahead, please help. Or we cannot disable that so far.
