diff options
| author | Mike Christie <michaelc@cs.wisc.edu> | 2005-11-30 08:12:59 +0300 |
|---|---|---|
| committer | James Bottomley <jejb@mulgrave.(none)> | 2005-12-14 04:12:00 +0300 |
| commit | 9e3961ba2be51a88c6223143568c80e0616d93ce (patch) | |
| tree | b811c3ab70d14997718596c9ec21a08561b34d5f | |
| parent | f6cfba1d21e9e4afd80e2274aa4df3dc1bd0aab7 (diff) | |
| download | linux-9e3961ba2be51a88c6223143568c80e0616d93ce.tar.xz | |
[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>
| -rw-r--r-- | drivers/scsi/iscsi_tcp.c | 20 | ||||
| -rw-r--r-- | drivers/scsi/iscsi_tcp.h | 3 |
2 files changed, 17 insertions, 6 deletions
diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c index 83e2f8c8e496..5b14c404069f 100644 --- a/drivers/scsi/iscsi_tcp.c +++ b/drivers/scsi/iscsi_tcp.c @@ -2402,6 +2402,15 @@ fault: } 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 @@ 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, }; diff --git a/drivers/scsi/iscsi_tcp.h b/drivers/scsi/iscsi_tcp.h index d23ae68fae0d..855f2dfd18af 100644 --- a/drivers/scsi/iscsi_tcp.h +++ b/drivers/scsi/iscsi_tcp.h @@ -71,7 +71,8 @@ #define ISCSI_MGMT_CMDS_MAX 32 /* must be power of 2 */ #define ISCSI_MGMT_ITT_OFFSET 0xa00 #define ISCSI_SG_TABLESIZE SG_ALL -#define ISCSI_CMD_PER_LUN 128 +#define ISCSI_DEF_CMD_PER_LUN 32 +#define ISCSI_MAX_CMD_PER_LUN 128 #define ISCSI_TCP_MAX_CMD_LEN 16 #define ITT_MASK (0xfff) |