Re: [PATCH] blk-settings: round down io_opt to at least 4K

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On Mon, Feb 03, 2025 at 10:05:27PM +0100, Mikulas Patocka wrote:
> Do you think that SSDs benefit from more alignment than 4K?

SSDs is a very broad category of devices.  But yes, many will.

> Based on my understanding (and some IOPS testing), SSDs have a remapping 
> table that maps every 4K block to the physical location. So, 8K (or 
> larger) I/Os don't have higher IOPS than 4K I/Os.

4K is the traditional value, but it has been increasing at least for
some classes of SSDs for a while.





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