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. -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
