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    SubjectRe: [PATCH 1/2] fs: Do not dispatch FITRIM through separate super_operation
    On Fri, Nov 19, 2010 at 10:21:35AM -0500, Mark Lord wrote:
    > >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.
    >
    > Excellent!

    I did a Windows 7 installation under qemu today, and the result is:

    - it TRIMs the whole device early during the installation
    - after that I see a constant stream of small trims during the
    installation. It's using lots of non-contiguous ranges in a single
    TRIM command, with sizes down to 8 sectors (4k) for a single range.
    - after installation there's is some background-trimming going on
    even when doing no user interaction with the VM at all.
    - removing files leads to an instant stream of TRIMs, again vectored
    and of all sizes down to 4k. Note that the TRIMs are a lot more
    instant than even with btrfs and -o discard, which delays most
    TRIMs until doing a sync.


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