[PATCH] Add test 248: Check filesystem FITRIM implementation

[Phil Karn]

What is the plan for TRIM support in XFS? I don't see any mention in the
2.6.36.2 sources, so I guess the code you guys have been discussing must not
be considered stable yet.

How will it eventually work? Will the filesystem automatically issue the
commands to the drive whenever a file is deleted, or will it always require
some sort of prodding from a userspace program?

And what kind of experiences are people having with XFS on current SSDs? I
just put an Intel drive in my newly upgraded box and I'm wondering if this
blazing performance will screech to a halt when my cumulative writes exceed
its 120 GB capacity. Does anyone have a standalone "drive optimizer" that
understands XFS, i.e, that can examine an unmounted file system and issue
the appropriate TRIM commands for every block on the free list?

Or is the Intel drive somehow really good at avoiding write amplification
even without TRIM help from the file system? I've heard that may be the
case, but I don't understand how that can be.

Phil
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