On Mon, 3 Feb 2025, Martin K. Petersen wrote: > > Hi Mikulas! > > > The purpose of this patch is to avoid doing I/O not aligned on 4k > > boundary. > > > > The 512-byte value that some SSDs report is just lie. > > So is 4K, though. Do you think that SSDs benefit from more alignment than 4K? 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. 2K and smaller I/Os have worse IOPS than 4K I/Os, because they perform read-modify-write cycle. If you have some SSD that has higher IOPS with alignment larger than 4K, let me know. Mikulas
