diff -NaurbB cacti_orig/cmd.php cacti_patch/cmd.php
--- cacti_orig/cmd.php	2004-02-24 22:10:04.000000000 +0100
+++ cacti_patch/cmd.php	2004-02-24 22:09:59.000000000 +0100
@@ -34,10 +34,20 @@
 include_once($config["base_path"] . "/lib/functions.php");
 include_once($config["base_path"] . "/lib/graph_export.php");
 
+/* FREQ_CMD  (in seconds)
+depends on crontab : 
+x/1 * * * * cactiuser php /var/www/html/cacti/cmd.php  ===> $FREQ_CMD=60 
+x/5 * * * * cactiuser php /var/www/html/cacti/cmd.php  ===> $FREQ_CMD=300 
+*/
+$FREQ_CMD=60;  /* we launch cmd.php every minute */
+
 $polling_items = db_fetch_assoc("select * from data_input_data_cache");
 
 if (sizeof($polling_items) > 0) {
 foreach ($polling_items as $item) {
+	if ($item["next_step"] <= $FREQ_CMD) {
+					$next_step=$item["rrd_step"] ;
+
 	switch ($item["action"]) {
 	case '0': /* snmp */
 		$output = cacti_snmp_get($item["hostname"], $item["snmp_community"], $item["arg1"], $item["snmp_version"], $item["snmp_username"], $item["snmp_password"], $item["snmp_port"], $item["snmp_timeout"]);
@@ -91,7 +101,15 @@
 	}
 	
 	rrdtool_function_create($item["local_data_id"], false);
-}
+	} else {
+					$next_step=$item["next_step"] - $FREQ_CMD;
+					}
+	/* Update data_input_data_cache for next execution of cmd.php */
+	if ($item["rrd_step"] != $FREQ_CMD)  {
+		db_execute("update data_input_data_cache set next_step=" . $next_step . " where local_data_id=" . $item["local_data_id"]);
+		print "Update poller cache : next_step= " . $next_step . " for " . $item["local_data_id"] ."\n";
+	}
+} //foreach
 }
 
 if (isset($update_cache_array)) {
diff -NaurbB cacti_orig/lib/utility.php cacti_patch/lib/utility.php
--- cacti_orig/lib/utility.php	2004-02-24 22:10:04.000000000 +0100
+++ cacti_patch/lib/utility.php	2004-02-24 22:10:00.000000000 +0100
@@ -46,7 +46,8 @@
 		data_input.type_id,
 		data_template_data.id as data_template_data_id,
 		data_template_data.data_template_id,
-		data_template_data.active
+		data_template_data.active,
+		data_template_data.rrd_step
 		from data_template_data,data_input
 		where data_template_data.data_input_id=data_input.id
 		and data_template_data.local_data_id=$local_data_id");
@@ -131,11 +132,11 @@
 			if ($action_type) {
 				db_execute("insert into data_input_data_cache (local_data_id,host_id,data_input_id,action,hostname,
 					snmp_community,snmp_version,snmp_timeout,snmp_username,snmp_password,snmp_port,rrd_name,rrd_path,
-					command,rrd_num) values ($local_data_id," . (empty($host["id"]) ? 0 : $host["id"]) . "," . $data_input["id"] . ",$action_type,'" . $host["hostname"] . "',
+					command,rrd_num,rrd_step,next_step) values ($local_data_id," . (empty($host["id"]) ? 0 : $host["id"]) . "," . $data_input["id"] . ",$action_type,'" . $host["hostname"] . "',
 					'" . $host["snmp_community"] . "','" . $host["snmp_version"] . "','" . $host["snmp_timeout"] . "',
 					'" . $host["snmp_username"] . "','" . $host["snmp_password"] . "','" . $host["snmp_port"] . "',
 					'" . get_data_source_name($data_template_rrd_id) . "',
-					'" . addslashes(clean_up_path(get_data_source_path($local_data_id,true))) . "','" . addslashes($command) . "',1)");
+					'" . addslashes(clean_up_path(get_data_source_path($local_data_id,true))) . "','" . addslashes($command) . "',1,". $data_input["rrd_step"] . "," . $data_input["rrd_step"] . ")");
 			}
 			
 			break;
@@ -152,11 +153,11 @@
 			
 			db_execute("insert into data_input_data_cache (local_data_id,host_id,data_input_id,action,hostname,
 				snmp_community,snmp_version,snmp_timeout,snmp_username,snmp_password,snmp_port,rrd_name,rrd_path,
-				arg1,rrd_num) values ($local_data_id," . (empty($host["id"]) ? 0 : $host["id"]) . "," . $data_input["id"]. ",0,'" . $host["hostname"] . "',
+				arg1,rrd_num,rrd_step,next_step) values ($local_data_id," . (empty($host["id"]) ? 0 : $host["id"]) . "," . $data_input["id"]. ",0,'" . $host["hostname"] . "',
 				'" . $host["snmp_community"] . "','" . $host["snmp_version"] . "','" . $host["snmp_timeout"] . "',
 				'" . $host["snmp_username"] . "','" . $host["snmp_password"] . "','" . $host["snmp_port"] . "',
 				'" . get_data_source_name($data_template_rrd_id) . "',
-				'" . addslashes(clean_up_path(get_data_source_path($local_data_id,true,1))) . "','" . $field["snmp_oid"] . "',1)");
+				'" . addslashes(clean_up_path(get_data_source_path($local_data_id,true,1))) . "','" . $field["snmp_oid"] . "',1" . $data_input["rrd_step"] . "," . $data_input["rrd_step"] . ")");
 			
 			break;
 		case '3': /* snmp query */
@@ -171,11 +172,11 @@
 				if (!empty($oid)) {
 					db_execute("insert into data_input_data_cache (local_data_id,host_id,data_input_id,action,hostname,
 						snmp_community,snmp_version,snmp_timeout,snmp_username,snmp_password,snmp_port,rrd_name,rrd_path,
-						arg1,rrd_num) values ($local_data_id," . (empty($host["id"]) ? 0 : $host["id"]) . "," . $data_input["id"]. ",0,'" . $host["hostname"] . "',
+						arg1,rrd_num,rrd_step,next_step) values ($local_data_id," . (empty($host["id"]) ? 0 : $host["id"]) . "," . $data_input["id"]. ",0,'" . $host["hostname"] . "',
 						'" . $host["snmp_community"] . "','" . $host["snmp_version"] . "','" . $host["snmp_timeout"] . "',
 						'" . $host["snmp_username"] . "','" . $host["snmp_password"] . "','" . $host["snmp_port"] . "',
 						'" . get_data_source_name($output["data_template_rrd_id"]) . "',
-						'" . addslashes(clean_up_path(get_data_source_path($local_data_id,true))) . "','$oid'," . sizeof($outputs) . ")");
+						'" . addslashes(clean_up_path(get_data_source_path($local_data_id,true))) . "','$oid'," . sizeof($outputs) . $data_input["rrd_step"] . "," . $data_input["rrd_step"] . ")");
 				}
 			}
 			}
@@ -203,12 +204,12 @@
 			
 				if (isset($script_path)) {
 					db_execute("insert into data_input_data_cache (local_data_id,host_id,data_input_id,action,hostname,
-						snmp_community,snmp_version,snmp_timeout,snmp_username,snmp_password,snmp_port,rrd_name,rrd_path,command,rrd_num) values 
+						snmp_community,snmp_version,snmp_timeout,snmp_username,snmp_password,snmp_port,rrd_name,rrd_path,command,rrd_num,rrd_step,next_step) values 
 						($local_data_id," . (empty($host["id"]) ? 0 : $host["id"]) . "," . $data_input["id"]. ",1,'" . $host["hostname"] . "',
 						'" . $host["snmp_community"] . "','" . $host["snmp_version"] . "','" . $host["snmp_timeout"] . "',
 						'" . $host["snmp_username"] . "','" . $host["snmp_password"] . "','" . $host["snmp_port"] . "',
 						'" . get_data_source_name($output["data_template_rrd_id"]) . "',
-						'" . addslashes(clean_up_path(get_data_source_path($local_data_id,true))) . "','" . addslashes($script_path) . "'," . sizeof($outputs) . ")");
+						'" . addslashes(clean_up_path(get_data_source_path($local_data_id,true))) . "','" . addslashes($script_path) . "'," . sizeof($outputs) . $data_input["rrd_step"] . "," . $data_input["rrd_step"] . ")");
 				}
 			}
 			}
diff -NaurbB cacti_orig/utilities.php cacti_patch/utilities.php
--- cacti_orig/utilities.php	2004-02-24 22:10:04.000000000 +0100
+++ cacti_patch/utilities.php	2004-02-24 22:09:59.000000000 +0100
@@ -143,6 +143,13 @@
 			</td>
 		</tr>
 		<?php
+		form_alternate_row_color($colors["form_alternate1"],$colors["form_alternate2"],$i); 
+		?>
+			<td>
+				RRD STEP/NEXT: <?php print $item["rrd_step"] . " / " . $item["next_step"];?>
+			</td>
+		</tr>
+		<?php
 		form_alternate_row_color($colors["form_alternate1"],$colors["form_alternate2"],$i); $i++;
 		?>
 			<td>