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    SubjectRe: [PATCH 1/2] fs: Do not dispatch FITRIM through separate super_operation
    On 10-11-19 09:57 AM, Christoph Hellwig wrote:
    > On Fri, Nov 19, 2010 at 09:53:52AM -0500, Mark Lord wrote:
    >> On 10-11-19 09:40 AM, Chris Mason wrote:
    >>>
    >>> We've been told that online and constant trimming is the default in
    >>> windows7. The ssds are most likely to just start ignoring the trims
    >>> they can't service efficiently.
    >>
    >> Win7 collects multiple TRIM ranges over time and batches them as single TRIMs
    >> (as reported to me by an SSD vendor who traced it with a SATA analyzer,
    >> and who also apparently has "inside info").
    >
    > I really hate to rely on this third party hearsay (from all sides), and
    > have implement TRIM support in qemu now. I'll soon install win7 and
    > will check out the TRIM patters myself.

    Here is some of the heresay about Win7:

    TRIM commands are sent when:
    -- About 2/3 of partition is filled up, when file is (really) deleted,
    not when merely sending file to trash bin.
    -- In the above case, when trash bin gets emptied.
    -- In the above case, when partition is deleted.

    So the behaviour may vary, depending upon how full the filesystem is
    at any point in time.

    Cheers


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