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    Subjectstrange but consistent feature of linux nfs client
    Hi,
    The linux nfs client (at least the one in 2.4.19)
    shows one characteristic :
    Consider a client side benchmark that creates a file
    across nfs, writes some data into it, reads this data
    back, modifies it and writes it back, finally reading
    it again and closing. (Assume that there isn't any
    other client operating on this nfs mounted filesystem
    that could pose a threat to the cached data validity
    on our client)
    Thus the order is like :
    write-read-write-read

    I observed without exception in all test runs that the
    second write-read combination had the read succeeding
    to find the data in the local cache(after suitable
    revalidation etc) while the first read operation in
    each individual test run never found the data in the
    local cache(although the first write too like the
    second write was done through the pagecache) or
    whatever but invariably made an on the wire read -
    always.

    So what is special - first time reads/first time
    writes and why,
    and how is this speciality affected in the kernel.

    thanks a lot
    Abhishek

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