On 8/17/23 04:53, Bart Van Assche wrote: > Measurements have shown that limiting the queue depth to one per zone for > zoned writes has a significant negative performance impact on zoned UFS > devices. Hence this patch that disables zone locking by the mq-deadline > scheduler if the storage controller preserves the command order. This > patch is based on the following assumptions: > - It happens infrequently that zoned write requests are reordered by the > block layer. > - The I/O priority of all write requests is the same per zone. > - Either no I/O scheduler is used or an I/O scheduler is used that > serializes write requests per zone. > > Cc: Damien Le Moal <dlemoal@xxxxxxxxxx> > Cc: Christoph Hellwig <hch@xxxxxx> > Cc: Ming Lei <ming.lei@xxxxxxxxxx> > Signed-off-by: Bart Van Assche <bvanassche@xxxxxxx> Looks OK to me. Reviewed-by: Damien Le Moal <dlemoal@xxxxxxxxxx> -- Damien Le Moal Western Digital Research
