Index: src/agent/subagents/ping/ping.h
===================================================================
--- src/agent/subagents/ping/ping.h	(revision 6725)
+++ src/agent/subagents/ping/ping.h	(working copy)
@@ -26,6 +26,7 @@
 #include <nms_common.h>
 #include <nms_util.h>
 #include <nms_agent.h>
+#include <math.h>
 
 
 //
@@ -46,7 +47,8 @@
    DWORD dwPacketSize;
    DWORD dwAvgRTT;
    DWORD dwLastRTT;
-	DWORD dwPacketLoss;
+   DWORD dwStdDevRTT;
+   DWORD dwPacketLoss;
    DWORD pdwHistory[MAX_POLLS_PER_MINUTE];
    int iBufPos;
    THREAD hThread;
Index: src/agent/subagents/ping/ping.cpp
===================================================================
--- src/agent/subagents/ping/ping.cpp	(revision 6725)
+++ src/agent/subagents/ping/ping.cpp	(working copy)
@@ -46,10 +46,9 @@
 static THREAD_RESULT THREAD_CALL PollerThread(void *arg)
 {
 	QWORD qwStartTime;
-	DWORD i, dwSum, dwLost, dwCount, dwInterval, dwElapsedTime;
+	DWORD i, dwSum, dwLost, dwCount, dwInterval, dwElapsedTime,dwStdDev;
 	BOOL bUnreachable;
 	PING_TARGET *target = (PING_TARGET *)arg;
-
 	while(!m_bShutdown)
 	{
 		bUnreachable = FALSE;
@@ -64,11 +63,15 @@
 		if (target->iBufPos == (int)m_dwPollsPerMinute)
 			target->iBufPos = 0;
 
-		for(i = 0, dwSum = 0, dwLost = 0, dwCount = 0; i < m_dwPollsPerMinute; i++)
+		for(i = 0, dwSum = 0, dwLost = 0, dwCount = 0,dwStdDev = 0; i < m_dwPollsPerMinute; i++)
 		{
 			if (target->pdwHistory[i] < 10000)
 			{
 				dwSum += target->pdwHistory[i];
+				if (target->pdwHistory[i] > 0)
+				{
+					dwStdDev += (target->dwAvgRTT - target->pdwHistory[i]) * (target->dwAvgRTT - target->pdwHistory[i]);
+				}
 				dwCount++;
 			}
 			else
@@ -78,10 +81,19 @@
 		}
 		target->dwAvgRTT = bUnreachable ? 10000 : (dwSum / dwCount);
 		target->dwPacketLoss = dwLost * 100 / m_dwPollsPerMinute;
+
+		if (dwCount > 0)
+		{
+			target->dwStdDevRTT = sqrt(dwStdDev / dwCount);
+		}
+		else
+		{
+			target->dwStdDevRTT = 0;
+		}
 		
 		dwElapsedTime = (DWORD)(GetCurrentTimeMs() - qwStartTime);
+		dwInterval = 60000 / m_dwPollsPerMinute;
 
-		dwInterval = 60000 / m_dwPollsPerMinute;
 		if (ConditionWait(m_hCondShutdown, (dwInterval > dwElapsedTime + 1000) ? dwInterval - dwElapsedTime : 1000))
 			break;
 	}
@@ -175,6 +187,9 @@
 		case _T('P'):
 			ret_uint(pValue, m_pTargetList[i].dwPacketLoss);
 			break;
+		case _T('D'):
+			ret_uint(pValue, m_pTargetList[i].dwStdDevRTT);
+			break;
 		default:
 			return SYSINFO_RC_UNSUPPORTED;
 	}
@@ -356,6 +371,7 @@
 	{ _T("Icmp.AvgPingTime(*)"), H_PollResult, _T("A"), DCI_DT_UINT, _T("Average response time of ICMP ping to {instance} for last minute") },
 	{ _T("Icmp.LastPingTime(*)"), H_PollResult, _T("L"), DCI_DT_UINT, _T("Response time of last ICMP ping to {instance}") },
 	{ _T("Icmp.PacketLoss(*)"), H_PollResult, _T("P"), DCI_DT_UINT, _T("Packet loss for ICMP ping to {instance}") },
+ 	{ _T("Icmp.PingStdDev(*)"), H_PollResult, _T("D"), DCI_DT_UINT, _T("Standard Deviation for ICMP ping to {instance}") },
 	{ _T("Icmp.Ping(*)"), H_IcmpPing, NULL, DCI_DT_UINT, _T("ICMP ping response time for {instance}") }
 };
 static NETXMS_SUBAGENT_LIST m_enums[] =