diff --git a/config.ini b/config.ini
index f9901e64..6aa53d89 100644
--- a/config.ini
+++ b/config.ini
@@ -1,12 +1,21 @@
 [dpdk]
-## Hexadecimal bitmask of cores to run on.
+# Hexadecimal bitmask of cores to run on.
 lcore_mask=1
+
+# Number of memory channels.
 channel=4
+
+# Specify base virtual address to map.
+#base_virtaddr=0x7f0000000000
+
+# Promiscuous mode of nic, defualt: enabled.
 promiscuous=1
 numa_on=1
-## TCP segment offload, default: disabled.
+
+# TCP segment offload, default: disabled.
 tso=0
-## HW vlan strip, default: enabled.
+
+# HW vlan strip, default: enabled.
 vlan_strip=1
 
 # sleep when no pkts incomming
@@ -27,40 +36,40 @@ idle_sleep=100
 #    1-3,4,7   ports 1,2,3,4,7 are enabled
 port_list=0
 
-## Port config section
-## Correspond to dpdk.port_list's index: port0, port1...
+# Port config section
+# Correspond to dpdk.port_list's index: port0, port1...
 [port0]
 addr=192.168.1.2
 netmask=255.255.255.0
 broadcast=192.168.1.255
 gateway=192.168.1.1
 
-## lcore list used to handle this port
-## the format is same as port_list
+# lcore list used to handle this port
+# the format is same as port_list
 # lcore_list= 0
 
-## Packet capture path, this will hurt performance
+# Packet capture path, this will hurt performance
 #pcap=./a.pcap
 
-## Kni config: if enabled and method=reject,
-## all packets that do not belong to the following tcp_port and udp_port
-## will transmit to kernel; if method=accept, all packets that belong to
-## the following tcp_port and udp_port will transmit to kernel.
+# Kni config: if enabled and method=reject,
+# all packets that do not belong to the following tcp_port and udp_port
+# will transmit to kernel; if method=accept, all packets that belong to
+# the following tcp_port and udp_port will transmit to kernel.
 #[kni]
 #enable=1
 #method=reject
-## The format is same as port_list
+# The format is same as port_list
 #tcp_port=80,443
 #udp_port=53
 
-## FreeBSD network performance tuning configurations.
-## Most native FreeBSD configurations are supported.
+# FreeBSD network performance tuning configurations.
+# Most native FreeBSD configurations are supported.
 [freebsd.boot]
 hz=100
 
-## Block out a range of descriptors to avoid overlap
-## with the kernel's descriptor space.
-## You can increase this value according to your app.
+# Block out a range of descriptors to avoid overlap
+# with the kernel's descriptor space.
+# You can increase this value according to your app.
 fd_reserve=1024
 
 kern.ipc.maxsockets=262144
diff --git a/lib/ff_config.c b/lib/ff_config.c
index 9ebc7c91..d9a2f6f6 100644
--- a/lib/ff_config.c
+++ b/lib/ff_config.c
@@ -420,6 +420,8 @@ ini_parse_handler(void* user, const char* section, const char* name,
     } else if (MATCH("dpdk", "lcore_mask")) {
         pconfig->dpdk.lcore_mask = strdup(value);
         return parse_lcore_mask(pconfig, pconfig->dpdk.lcore_mask);
+    } else if (MATCH("dpdk", "base_virtaddr")) {
+        pconfig->dpdk.base_virtaddr= strdup(value);
     } else if (MATCH("dpdk", "port_list")) {
         return parse_port_list(pconfig, value);
     } else if (MATCH("dpdk", "promiscuous")) {
@@ -485,6 +487,10 @@ dpdk_args_setup(struct ff_config *cfg)
         sprintf(temp, "--proc-type=%s", cfg->dpdk.proc_type);
         dpdk_argv[n++] = strdup(temp);
     }
+    if (cfg->dpdk.base_virtaddr) {
+        sprintf(temp, "--base-virtaddr=%s", cfg->dpdk.base_virtaddr);
+        dpdk_argv[n++] = strdup(temp);
+    }
 
     dpdk_argc = n;
 
@@ -520,7 +526,7 @@ ff_parse_args(struct ff_config *cfg, int argc, char *const argv[])
     if (strcmp(cfg->dpdk.proc_type, "primary") &&
         strcmp(cfg->dpdk.proc_type, "secondary") &&
         strcmp(cfg->dpdk.proc_type, "auto")) {
-        printf("invalid proc-type\n");
+        printf("invalid proc-type:%s\n", cfg->dpdk.proc_type);
         return -1;
     }
 
diff --git a/lib/ff_config.h b/lib/ff_config.h
index 6424b0da..2ecaf1f5 100644
--- a/lib/ff_config.h
+++ b/lib/ff_config.h
@@ -79,6 +79,9 @@ struct ff_config {
         /* mask of current proc on all lcores */
         char *proc_mask;
 
+        /* specify base virtual address to map. */
+        char *base_virtaddr;
+
         int nb_channel;
         int memory;
         int no_huge;
diff --git a/lib/ff_dpdk_if.c b/lib/ff_dpdk_if.c
index dcf2b44d..1d10516f 100644
--- a/lib/ff_dpdk_if.c
+++ b/lib/ff_dpdk_if.c
@@ -419,18 +419,21 @@ create_ring(const char *name, unsigned count, int socket_id, unsigned flags)
 {
     struct rte_ring *ring;
 
-    if (name == NULL)
-        return NULL;
-
-    /* If already create, just attached it */
-    if (likely((ring = rte_ring_lookup(name)) != NULL))
-        return ring;
+    if (name == NULL) {
+        rte_exit(EXIT_FAILURE, "create ring failed, no name!\n");
+    }
 
     if (rte_eal_process_type() == RTE_PROC_PRIMARY) {
-        return rte_ring_create(name, count, socket_id, flags);
+        ring = rte_ring_create(name, count, socket_id, flags);
     } else {
-        return rte_ring_lookup(name);
+        ring = rte_ring_lookup(name);
     }
+
+    if (ring == NULL) {
+        rte_exit(EXIT_FAILURE, "create ring:%s failed!\n", name);
+    }
+
+    return ring;
 }
 
 static int