[dpdk-users] 2VMs with dpdk app-testpmd effect each other

鄭凱懋 kmcheng at cht.com.tw
Fri Sep 9 10:18:37 CEST 2016
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1.Are you using 2 10G port to inject traffic?
Ans: No. one for in, one for out. i used opeflow rule to separate the incoming stream into two VMs.

2.What's your qemu launch commands for each VM?
Ans:

taskset -c 8,10 ./qemu-2.5.1.1/x86_64-softmmu/qemu-system-x86_64 -cpu host -enable-kvm -m 4096M -smp 4 -nographic -k en-us -vnc :1 -pidfile /usr/local/var/run/openvswitch/vm1.pid,snapshot=off -monitor unix:/usr/local/var/run/openvswitch/vm1monitor,server,nowait\
    -object memory-backend-file,id=mem,size=4096M,mem-path=/dev/hugepages,share=on -numa node,memdev=mem -mem-prealloc \
    -chardev socket,id=char0,path=/usr/local/var/run/openvswitch/vhost-user-1 \
    -netdev type=vhost-user,id=mynet1,chardev=char0,vhostforce \
    -device virtio-net-pci,netdev=mynet1,mac=52:54:00:02:d9:01 \
    -chardev socket,id=char1,path=/usr/local/var/run/openvswitch/vhost-user-2 \
    -netdev type=vhost-user,id=mynet2,chardev=char1,vhostforce \
    -device virtio-net-pci,netdev=mynet2,mac=52:54:00:02:d9:02 \
    vm1.qcow2


taskset -c 12,14 ./qemu-2.5.1.1/x86_64-softmmu/qemu-system-x86_64 -cpu host -enable-kvm -m 4096M -smp 4 -nographic -k en-us -vnc :2 -pidfile /usr/local/var/run/openvswitch/vm2.pid,snapshot=off -monitor unix:/usr/local/var/run/openvswitch/vm1monitor,server,nowait\
    -object memory-backend-file,id=mem,size=4096M,mem-path=/dev/hugepages,share=on -numa node,memdev=mem -mem-prealloc \
    -chardev socket,id=char2,path=/usr/local/var/run/openvswitch/vhost-user-3 \
    -netdev type=vhost-user,id=mynet3,chardev=char2,vhostforce \
    -device virtio-net-pci,netdev=mynet3,mac=52:54:00:02:d9:03 \
    -chardev socket,id=char3,path=/usr/local/var/run/openvswitch/vhost-user-4 \
    -netdev type=vhost-user,id=mynet4,chardev=char3,vhostforce \
    -device virtio-net-pci,netdev=mynet4,mac=52:54:00:02:d9:04 \
    vm2.qcow2

3.Can you use "top -H" command to check the core usage when u running the case2 and case3? 
Ans:
Case2:
105561 root      20   0 41.660g  27388   2300 R 99.9  0.0   1487:40 pmd39                                                 
105562 root      20   0 41.660g  27388   2300 R 99.9  0.0   1488:13 pmd38                                                 
105563 root      20   0 41.660g  27388   2300 R 99.9  0.0   1488:12 pmd37                                                 
105564 root      20   0 41.660g  27388   2300 R 99.9  0.0   1488:13 pmd36                                                 
119509 root      20   0 4929700  57736   5296 R 99.9  0.1   7:01.16 qemu-system-x86

Case3:
119509 root      20   0 4929700  57736   5296 R 99.9  0.1   8:44.03 qemu-system-x86                                       
105561 root      20   0 41.660g  27388   2300 R 99.9  0.0   1489:23 pmd39                                                 
105562 root      20   0 41.660g  27388   2300 R 99.9  0.0   1489:55 pmd38                                                 
105563 root      20   0 41.660g  27388   2300 R 99.9  0.0   1489:55 pmd37                                                 
105564 root      20   0 41.660g  27388   2300 R 99.9  0.0   1489:55 pmd36

case2 and case 3 seems nothing different~~

-----Original Message-----
From: Xu, Qian Q [mailto:qian.q.xu at intel.com] 
Sent: Wednesday, September 07, 2016 10:11 AM
To: 鄭凱懋; users at dpdk.org
Subject: RE: 2VMs with dpdk app-testpmd effect each other

It's not normal, and I think first we need figure out it's DPDK issue or OVS issue or some configuration issue. 
Are you using 2 10G port to inject traffic? 
What's your qemu launch commands for each VM?
Can you use "top -H" command to check the core usage when u running the case2 and case3? 


-----Original Message-----
From: 鄭凱懋 [mailto:kmcheng at cht.com.tw] 
Sent: Wednesday, September 7, 2016 10:04 AM
To: Xu, Qian Q <qian.q.xu at intel.com>; users at dpdk.org
Subject: RE: 2VMs with dpdk app-testpmd effect each other

So my question is : is it normal ?
Is there any way i can solve the problem?

Is the problem related to qemu-img? 
________________________________________
從: 鄭凱懋
寄件日期: 2016年9月2日 下午 01:37
至: Xu, Qian Q; users at dpdk.org
主旨: RE: 2VMs with dpdk app-testpmd effect each other

I am sure that VM1 and VM2 are using different core with different coremask setting.
Yes, I know that default fwd enging is IO fwd. And fwd engine will start while testpmd is started.

I used "stop" command to stop fwd engine inside testpmd.
The I can see effect ion on the other VM.

-----Original Message-----
From: Xu, Qian Q [mailto:qian.q.xu at intel.com]
Sent: Thursday, September 01, 2016 9:36 AM
To: 鄭凱懋; users at dpdk.org
Subject: RE: 2VMs with dpdk app-testpmd effect each other

Maybe VM1 and VM2 are using the same core for the forwarding? I guess 2VMs are using the same core for fwd.
What do you mean by testpmd fwd=none, if you don't set the fwd mode, it's IO fwd.

-----Original Message-----
From: users [mailto:users-bounces at dpdk.org] On Behalf Of ???
Sent: Thursday, September 1, 2016 8:47 AM
To: users at dpdk.org
Subject: [dpdk-users] 2VMs with dpdk app-testpmd effect each other

Hi all

I am facing a wierd situation when i start testpmd app inside two VMs( Case 3 ).
Please see the following setup.


Hardware Information

System

Dell Inc. PowerEdge R630

　

　

BIOS

Dell Inc. version1.0.4

　

CPU

Intel(R) Xeon(R) x86_64 E5-2630 v3 2.40 Ghz

　

Processor(s): 16

　

　

Cache: 20480 KB

　

　

　

Memory

Size: 16 GB*6

　

　

　

　

Type: DDR4

　

　

Speed: 2133MHz

　

　

　

Ethernet Controller

Intel Corporation Ethernet 10G 2P X520 Adapter *2


Software information
Qemu = qemu-2.5.1.1
DPDK = dpdk-2.2.0
OVS = ovs-branch-2.5

Input stream : 10Gbps(5G with vlan 1001 and 5G with vlan 1002) which is generated by Spirent testcenter

| VM1 |       | VM2 |

 ↑1001↓      ↑1002↓
-----------------------
|    OVS        |
-----------------------
        ↑       ↓
-----------------------
 TestCenter     |
-----------------------

ovs setup:
  modprobe openvswitch
  rm -rf /usr/local/var/run/openvswitch/*
  rm -rf /opt/ovs-vswitchd.log
  modprobe uio
  insmod $DPDK_BUILD/kmod/igb_uio.ko
  $DPDK_DIR/tools/dpdk_nic_bind.py --bind=igb_uio p3p1
  $DPDK_DIR/tools/dpdk_nic_bind.py --bind=igb_uio p3p2
  $DPDK_DIR/tools/dpdk_nic_bind.py --status
  rm /usr/local/etc/openvswitch/conf.db -rf
  mkdir -p /usr/local/etc/openvswitch
  mkdir -p /usr/local/var/run/openvswitch
  cd $OVS_DIR
  ./ovsdb/ovsdb-tool create /usr/local/etc/openvswitch/conf.db ./vswitchd/vswitch.ovsschema
  ./ovsdb/ovsdb-server --remote=punix:/usr/local/var/run/openvswitch/db.sock --remote=db:Open_vSwitch,Open_vSwitch,manager_options --private-key=db:Open_vSwitch,SSL,private_key --certificate=db:Open_vSwitch,SSL,certificate --bootstrap-ca-cert=db:Open_vSwitch,SSL,ca_cert --pidfile --detach

  ./utilities/ovs-vsctl --no-wait init
  ./utilities/ovs-vsctl --no-wait set Open_vSwitch . other_config:dpdk-init=true
  ./vswitchd/ovs-vswitchd --dpdk --socket-mem 4096,4096 -n 4 -- unix:/usr/local/var/run/openvswitch/db.sock --log-file=$OVS_LOG --pidfile --detach


Case 1:
VM1 start testpmd, fwd = iofwd
VM2 start testpmd,fwd = iofwd
Result =  Spirent testcenter show output stream is reaching line speed 10G.


Case 2:
VM1 testpmd = started, fwd = iofwd
VM2 testpmd=stopped,fwd = none
Result =  Spirent testcenter show output stream is reaching 5G.
Which is reasonable.

Case 3:
VM1 testpmd = started, fwd = iofwd
VM2 testpmd = started ,fwd = none
Result =  Spirent testcenter show output stream is less than 200Mbps.



I am confused about the case 3. What is the reason VM2 effects VM1 so significantly?
How can i solve such problem? I will appreciate for your answer.
Thx


============================
鄭凱懋 Kai-Mao Cheng
中華電信研究院 寬頻網路研究所 231計畫
電話:03-4244093 手機:0912314847
E-mail:kmcheng at cht.com.tw
============================


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