From 9e3961ba2be51a88c6223143568c80e0616d93ce Mon Sep 17 00:00:00 2001 From: Mike Christie Date: Tue, 29 Nov 2005 23:12:59 -0600 Subject: [SCSI] iscsi: lower queue depth From Wang Zhenyu: High queue depth was a problem for some targets so make queue_depth adjustable From Mike Christie Make default queue_depth a little lower Signed-off-by: Mike Christie Signed-off-by: Alex Aizman Signed-off-by: Dmitry Yusupov Signed-off-by: James Bottomley --- drivers/scsi/iscsi_tcp.c | 20 +++++++++++++++----- 1 file changed, 15 insertions(+), 5 deletions(-) (limited to 'drivers/scsi/iscsi_tcp.c') diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c index 83e2f8c8e49..5b14c404069 100644 --- a/drivers/scsi/iscsi_tcp.c +++ b/drivers/scsi/iscsi_tcp.c @@ -2401,6 +2401,15 @@ fault: return 0; } +static int +iscsi_change_queue_depth(struct scsi_device *sdev, int depth) +{ + if (depth > ISCSI_MAX_CMD_PER_LUN) + depth = ISCSI_MAX_CMD_PER_LUN; + scsi_adjust_queue_depth(sdev, scsi_get_tag_type(sdev), depth); + return sdev->queue_depth; +} + static int iscsi_pool_init(struct iscsi_queue *q, int max, void ***items, int item_size) { @@ -3260,13 +3269,14 @@ iscsi_r2tpool_free(struct iscsi_session *session) static struct scsi_host_template iscsi_sht = { .name = "iSCSI Initiator over TCP/IP, v." ISCSI_VERSION_STR, - .queuecommand = iscsi_queuecommand, + .queuecommand = iscsi_queuecommand, + .change_queue_depth = iscsi_change_queue_depth, .can_queue = ISCSI_XMIT_CMDS_MAX - 1, .sg_tablesize = ISCSI_SG_TABLESIZE, - .cmd_per_lun = ISCSI_CMD_PER_LUN, - .eh_abort_handler = iscsi_eh_abort, - .eh_host_reset_handler = iscsi_eh_host_reset, - .use_clustering = DISABLE_CLUSTERING, + .cmd_per_lun = ISCSI_DEF_CMD_PER_LUN, + .eh_abort_handler = iscsi_eh_abort, + .eh_host_reset_handler = iscsi_eh_host_reset, + .use_clustering = DISABLE_CLUSTERING, .proc_name = "iscsi_tcp", .this_id = -1, }; -- cgit v1.2.3