> I am newbie on ext4, I tried the above method to disable readahead, echo 0 > /sys/block/<dev>/queue/read_ahead_kb > Then I read by 128kB chunk size, ext4 will read the file by 4KB chunk size each time. that means ext4 splits 128KB into 32 4KB to read. > That's not my expectation. > Do you know how to still keep and let ext4 read by 128KB in case of disable readahead? > Thanks. > > //bean huo I guess you're doing buffered IO, have you try to use direct IO? Cheers, Jack
