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    SubjectRe: Direct I/O bug in kernel
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    On Fri, Aug 10, 2012 at 4:53 AM, Victor Meyerson
    <calculuspenguin@yahoo.com> wrote:
    > I tried that patch, although I had to edit a slightly different line as dio_bio_alloc was near line 392 instead of 349 in the version of fs/direct-io.c in my tree. I still got different checksums between the two files and even different checksums from my earlier attempts.
    >
    > I am not sure if this helps, but Ralf asked if I can try a different page size to see if this problem occurs. I originally had CONFIG_PAGE_SIZE_4KB=y and changed it to CONFIG_PAGE_SIZE_16KB=y (via menuconfig). Having a page size of 16KB (and the above patch not applied) made the checksum on the files match each other and match the file made from the working kernel.
    >

    Thanks for tests, Victor.

    Please elaborate on the role of page size in this case, Ralf.

    Good Weekend
    Hillf


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