[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 <michaelc@cs.wisc.edu>
Signed-off-by: Alex Aizman <itn780@yahoo.com>
Signed-off-by: Dmitry Yusupov <dmitry_yus@yahoo.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
index 83e2f8c..5b14c40 100644
--- a/drivers/scsi/iscsi_tcp.c
+++ b/drivers/scsi/iscsi_tcp.c
@@ -2402,6 +2402,15 @@
}
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)
{
int i;
@@ -3260,13 +3269,14 @@
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,
};