On 09/25/2013 10:48 AM, Chris Murphy wrote:
On Sep 25, 2013, at 6:12 AM, Ric Wheeler <rwheeler@xxxxxxxxxx> wrote:
We should not confuse TRIM that gets handled at the device layer (and is a slow, non-queued S-ATA command for example) and a dm-thin parsing of that same command in software which just updates the metadata that dm-thin maintains.
Yes, fair point. I should have qualified the assertion better to indicate default discard to the physical device is probably not a good idea. Or maybe it needs to get smarter, and initiated when the fs isn't particularly busy. A kind of delayed discard.
Chris Murphy
We do have fstrim - you run it periodically on an online file system and it
sends down larger discard requests. That is actually pretty much always the
best way to go.
That said, we definitely could use lots of work on looking at performance on top
of dm-thin (with/without the discard mount options)....
Ric
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