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Re: [dm-devel] [RFC 1/2] block: implement an unprep function corresponding directly to prep

On 07/05/2010 05:54 PM, Mark Lord wrote:
On 05/07/10 03:24 PM, Christoph Hellwig wrote:

What codebase were you testing on? Sorry, but curently I'm a bit lost
in the maze of patches. I've got both and intel and an OCZ SSD

Do you, or anyone else with one, know what the upper limit is on
TRIM operations with the Intel SSDs ?

I need to know the maximum amount of TRIM ranges they will process
in a single command.

Eg. Indilinx-based SSDs don't appear to have a limit -- they'll accept
a TRIM command with thousands of LBA ranges included.

Sandforce-based SSDs appear to restrict things to max 4KB of range data.

So.. what about Intel?

Lovely :( I wonder if we could test for that limit at mke2fs time, or similar.

Seeing a 4k limit on other SSDs would not surprise me. Or even a 512-b limit.


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