s390/dasd: fix performance drop
authorStefan Haberland <sth@linux.vnet.ibm.com>
Fri, 12 Feb 2016 13:50:52 +0000 (14:50 +0100)
committerMartin Schwidefsky <schwidefsky@de.ibm.com>
Wed, 17 Feb 2016 08:24:07 +0000 (09:24 +0100)
Commit ca369d51b ("sd: Fix device-imposed transfer length limits")
introduced a new queue limit max_dev_sectors which limits the maximum
sectors for requests. The default value leads to small dasd requests
and therefor to a performance drop.
Set the max_dev_sectors value to the same value as the max_hw_sectors
to use the maximum available request size for DASD devices.

Signed-off-by: Stefan Haberland <sth@linux.vnet.ibm.com>
Cc: stable@vger.kernel.org # 4.4+
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
drivers/s390/block/dasd.c

index 41605da..c78db05 100644 (file)
@@ -3035,6 +3035,7 @@ static void dasd_setup_queue(struct dasd_block *block)
                max = block->base->discipline->max_blocks << block->s2b_shift;
        }
        queue_flag_set_unlocked(QUEUE_FLAG_NONROT, block->request_queue);
+       block->request_queue->limits.max_dev_sectors = max;
        blk_queue_logical_block_size(block->request_queue,
                                     block->bp_block);
        blk_queue_max_hw_sectors(block->request_queue, max);