Increase MAX_NR_QUEUED_CMNDS to better handle multu-LUs per target cases

git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@4496 d57e44dd-8a1f-0410-8b47-8ef2f437770f

iscsi-scst/include/iscsi_scst.h

@@ -185,7 +185,7 @@ struct iscsi_kern_initiator_info {
 
 #define	DEFAULT_NR_QUEUED_CMNDS	32
 #define	MIN_NR_QUEUED_CMNDS	1
-#define	MAX_NR_QUEUED_CMNDS	256
+#define	MAX_NR_QUEUED_CMNDS	2048
 
 #define DEFAULT_RSP_TIMEOUT	90
 #define MIN_RSP_TIMEOUT		2

iscsi-scst/kernel/config.c

@@ -1057,7 +1057,17 @@ static int iscsi_register(void __user *arg)
 
 	memset(&reg, 0, sizeof(reg));
 	reg.max_data_seg_len = ISCSI_CONN_IOV_MAX << PAGE_SHIFT;
+
+	/*
+	 * In iSCSI all LUs in a session share queue depth, so let's not
+	 * limit it too much for thousands of LUs VMware and other similar
+	 * systems cases.
+	 */
+#if 0
 	reg.max_queued_cmds = scst_get_max_lun_commands(NULL, NO_SUCH_LUN);
+#else
+	reg.max_queued_cmds = MAX_NR_QUEUED_CMNDS;
+#endif
 
 	res = 0;
 

iscsi-scst/kernel/param.c

@@ -209,8 +209,7 @@ static void tgt_params_check(struct iscsi_session *session,
 	 */
 
 	CHECK_PARAM(info, iparams, queued_cmnds, MIN_NR_QUEUED_CMNDS,
-		min_t(int, MAX_NR_QUEUED_CMNDS,
-		      scst_get_max_lun_commands(session->scst_sess, NO_SUCH_LUN)));
+		MAX_NR_QUEUED_CMNDS);
 	CHECK_PARAM(info, iparams, rsp_timeout, MIN_RSP_TIMEOUT,
 		MAX_RSP_TIMEOUT);
 	CHECK_PARAM(info, iparams, nop_in_interval, MIN_NOP_IN_INTERVAL,