Messages in this thread | | | Date | Fri, 19 Nov 2010 10:30:38 -0500 | From | Mark Lord <> | Subject | Re: [PATCH 1/2] fs: Do not dispatch FITRIM through separate super_operation |
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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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