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authorMartin K. Petersen <martin.petersen@oracle.com>2015-12-17 01:53:51 +0300
committerMartin K. Petersen <martin.petersen@oracle.com>2015-12-22 06:14:47 +0300
commit32c5844abb302e3fb1637ba6afe3d8132c64e57f (patch)
treea5b124a7e0bde243e0c2a75ddb1f4490e95a16f4 /drivers/scsi
parentb034573c7eb39aa58cd4a08e487869fea6d4ad2d (diff)
downloadlinux-32c5844abb302e3fb1637ba6afe3d8132c64e57f.tar.xz
scsi_debug: Increase the reported optimal transfer length
The OPTIMAL TRANSFER LENGTH reported by scsi_debug is 64 blocks which translates to 32KB with the default logical block size. That's much lower than what real storage devices typically report (256KB to 1MB). Bump the optimal transfer length to 1024 blocks. Acked-by: Douglas Gilbert <dgilbert@interlog.com> Reviewed-by: Ewan Milne <emilne@redhat.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi')
-rw-r--r--drivers/scsi/scsi_debug.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index 1bea1adc16a8..237b691c8e0a 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -129,7 +129,7 @@ static const char *scsi_debug_version_date = "20141022";
#define DEF_NO_LUN_0 0
#define DEF_NUM_PARTS 0
#define DEF_OPTS 0
-#define DEF_OPT_BLKS 64
+#define DEF_OPT_BLKS 1024
#define DEF_PHYSBLK_EXP 0
#define DEF_PTYPE 0
#define DEF_REMOVABLE false
@@ -4139,7 +4139,7 @@ MODULE_PARM_DESC(no_lun_0, "no LU number 0 (def=0 -> have lun 0)");
MODULE_PARM_DESC(no_uld, "stop ULD (e.g. sd driver) attaching (def=0))");
MODULE_PARM_DESC(num_parts, "number of partitions(def=0)");
MODULE_PARM_DESC(num_tgts, "number of targets per host to simulate(def=1)");
-MODULE_PARM_DESC(opt_blks, "optimal transfer length in block (def=64)");
+MODULE_PARM_DESC(opt_blks, "optimal transfer length in blocks (def=1024)");
MODULE_PARM_DESC(opts, "1->noise, 2->medium_err, 4->timeout, 8->recovered_err... (def=0)");
MODULE_PARM_DESC(physblk_exp, "physical block exponent (def=0)");
MODULE_PARM_DESC(ptype, "SCSI peripheral type(def=0[disk])");