On 2024/12/16 13:22, Bart Van Assche wrote: > On 12/16/24 12:54 PM, Damien Le Moal wrote: >> Yes. But I am still confused. Where is the problem ? > > Here: > https://lore.kernel.org/linux-block/95ab028e-6cf7-474e-aa33-37ab3bccd078@xxxxxxxxxx/. > In that message another approach is > suggested than what I described in my previous message. OK. So you are talking about an issue that potentially can happen *if* you modify zone write plugging to issue more than one write at a time per zone. This issue of reordering cannot happen today as there is always at most one write per zone in-flight. > UFSHCI 3.0 controllers preserve the command order except if these are in > a power-saving mode called auto-hibernation (AH8). When leaving that > mode, commands are submitted in tag order (0..31). The approach > described above provides an elegant solution for the unaligned write > errors that can be caused by command reordering when leaving AH8 mode. > I'm not aware of any other elegant approach to deal with the reordering > that can be caused by leaving the UFSHCI AH8 mode. As I said, I do not know enough about UFS to comment on potential solutions as I do not fully grasp the problem. -- Damien Le Moal Western Digital Research
