On 23/08/22 12:16PM, 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. Reviewed-by: Damien Le Moal <dlemoal@xxxxxxxxxx> Cc: Christoph Hellwig <hch@xxxxxx> Cc: Ming Lei <ming.lei@xxxxxxxxxx> Signed-off-by: Bart Van Assche <bvanassche@xxxxxxx> --- block/mq-deadline.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-)
Reviewed-by: Nitesh Shetty <nj.shetty@xxxxxxxxxxx>
