slow ping into gre tunnel

hi all,

I am testing Havana openstack release with "per tenant netwok with private subnet".

I 'm using namspace + OVS + GRE.

ping is very slow between gre tunnel interfaces

ping 172.17.0.2
PING 172.17.0.2 (172.17.0.2) 56(84) bytes of data.
64 bytes from 172.17.0.2: icmp_req=1 ttl=64 time=1683 ms
64 bytes from 172.17.0.2: icmp_req=2 ttl=64 time=684 ms
64 bytes from 172.17.0.2: icmp_req=3 ttl=64 time=5111 ms
64 bytes from 172.17.0.2: icmp_req=4 ttl=64 time=4103 ms
64 bytes from 172.17.0.2: icmp_req=5 ttl=64 time=3095 ms
64 bytes from 172.17.0.2: icmp_req=6 ttl=64 time=2087 ms
64 bytes from 172.17.0.2: icmp_req=7 ttl=64 time=1079 ms
64 bytes from 172.17.0.2: icmp_req=8 ttl=64 time=71.1 ms
64 bytes from 172.17.0.2: icmp_req=9 ttl=64 time=897 ms

With iperf bandwitch is very samll on 1GB link.

oot@os-mgmt1:~# iperf -s
------------------------------------------------------------
Server listening on TCP port 5001
TCP window size: 85.3 KByte (default)
------------------------------------------------------------
[ 4] local 172.17.0.1 port 5001 connected with 172.17.0.2 port 35791
[ ID] Interval Transfer Bandwidth
[ 4] 0.0-21.7 sec 1.25 MBytes 483 Kbits/sec

root@os-com1:~# iperf -c 172.17.0.1
-----------------------------------------------------------
Client connecting to 172.17.0.1, TCP port 5001
TCP window size: 22.9 KByte (default)
------------------------------------------------------------
[ 3] local 172.17.0.2 port 35791 connected with 172.17.0.1 port 5001
[ ID] Interval Transfer Bandwidth
[ 3] 0.0-21.7 sec 1.25 MBytes 484 Kbits/sec

My configuration:

On network node:

ifconfig eth4
eth4 Link encap:Ethernet HWaddr 00:15:17:8b:54:17
          inet addr:172.17.0.1 Bcast:172.17.0.255 Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
          RX packets:333 errors:0 dropped:0 overruns:0 frame:0
          TX packets:253 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:422348 (422.3 KB) TX bytes:19390 (19.3 KB)
          Interrupt:28 Memory:f7fa0000-f7fc0000

 ethtool -k eth4
Features for eth4:
rx-checksumming: on
tx-checksumming: on
 tx-checksum-ipv4: off [fixed]
 tx-checksum-ip-generic: on
 tx-checksum-ipv6: off [fixed]
 tx-checksum-fcoe-crc: off [fixed]
 tx-checksum-sctp: off [fixed]
scatter-gather: on
 tx-scatter-gather: on
 tx-scatter-gather-fraglist: off [fixed]
tcp-segmentation-offload: on
 tx-tcp-segmentation: on
 tx-tcp-ecn-segmentation: off [fixed]
 tx-tcp6-segmentation: on
udp-fragmentation-offload: off [fixed]
generic-segmentation-offload: on
generic-receive-offload: off
large-receive-offload: off [fixed]
rx-vlan-offload: on
tx-vlan-offload: on
ntuple-filters: off [fixed]
receive-hashing: on
highdma: on [fixed]
rx-vlan-filter: on [fixed]
vlan-challenged: off [fixed]
tx-lockless: off [fixed]
netns-local: off [fixed]
tx-gso-robust: off [fixed]
tx-fcoe-segmentation: off [fixed]
fcoe-mtu: off [fixed]
tx-nocache-copy: on
loopback: off [fixed]
rx-fcs: off
rx-all: off

Linux os-mgmt1 3.8.0-34-generic

ovs-show : http://paste.openstack.org/show/54598/

eth4 is intel pro 1000

On compute:

ifconfig eth3
eth3 Link encap:Ethernet HWaddr 00:10:18:27:0e:61
          inet addr:172.17.0.2 Bcast:172.17.0.255 Mask:255.255.255.0
          UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
          RX packets:202 errors:0 dropped:0 overruns:0 frame:0
          TX packets:290 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:14938 (14.9 KB) TX bytes:402282 (402.2 KB)
          Interrupt:17

eth3 is Broadcom BCM5708

Linux os-com1 3.8.0-34-generic

ovs-show : http://paste.openstack.org/show/54596/

I don't see where i'am doing an error .

Thanks