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    SubjectRe: [RESEND] [PATCH] readahead:add blk_run_backing_dev

    Vladislav Bolkhovitin, on 07/10/2009 12:43 PM wrote:
    > Ronald Moesbergen, on 07/10/2009 10:32 AM wrote:
    >>> I've also long ago noticed that reading data from block devices is slower
    >>> than from files from mounted on those block devices file systems. Can
    >>> anybody explain it?
    >>> Looks like this is strangeness #2 which we uncovered in our tests (the first
    >>> one was earlier in this thread why the context RA doesn't work with
    >>> cooperative I/O threads as good as it should).
    >>> Can you rerun the same 11 tests over a file on the file system, please?
    >> I'll see what I can do. Just te be sure: you want me to run
    >> blockdev-perftest on a file on the OCFS2 filesystem which is mounted
    >> on the client over iScsi, right?
    > Yes, please.

    Forgot to mention that you should also configure your backend storage as
    a big file on a file system (preferably, XFS) too, not as direct device,
    like /dev/vg/db-master.


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