> >> 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? > Direct I/O is another case, it is true that will bypass readahead. But I want to disable readahead with page cache. >Cheers, >Jack
