[dpdk-dev] l2fwd program reported 100Mbps on a 10Gbps physical port using virtio or e1000 port in CentOS guest OS using DPDK 1.3.1r2
James Yu
ypyu2011 at gmail.com
Wed Nov 27 00:01:39 CET 2013
I have a Ubuntu 12.04.3 LTS (Linux 3.2.0-53-generic) KVM host. The guest OS
is a CentOS 32bit (CentOS 6.2, Linux 2.6.32-220.el6.i686). There are two
10G ports on the KVM host with the following kvm.
root at openstack1:~# kvm --version
QEMU emulator version 1.2.0 (qemu-kvm-1.2.0), Copyright (c) 2003-2008
Fabrice Bellard
root at openstack1:~# libvirtd --version
libvirtd (libvirt) 0.9.8
The DPDK l2fwd runs inside a CentOS 6.2 OS (2.6.32-220.el6.i686 32bit
Linux) on a RHEL 6.1 KVM host (2.6.32-131.0.15.e16.x86_64).
THE PROBLEM:
Using DPDK 1.3.1r2, I got the following message to indicate the port speed
of a virtio port that l2fwd listened to for received packets. It reports as
100Mbps only although the physical port is a 10G port (Intel x520 PN
49Y7960, http://www.redbooks.ibm.com/abstracts/tips0893.html?Open). Is this
expected on the DPDK side ?
Checking link status done
Port 0 Link Up - speed *100 Mbps *- full-duplex
Port statistics ====================================
Statistics for port 0 ------------------------------
Packets sent: 0
Packets received: 0
Packets dropped: 0
Aggregate statistics ===============================
Total packets sent: 0
Total packets received: 0
Total packets dropped: 0
====================================================
The KVM information:
[root at rh188 ~]# libvirtd --version
libvirtd (libvirt) 0.10.2
[root at rh188 ~]# /usr/libexec/qemu-kvm --version
QEMU PC emulator version 0.12.1 (qemu-kvm-0.12.1.2), Copyright (c)
2003-2008 Fabrice Bellard
--
On the KVM host, physical port eth6 is 10Gbps
[root at rh188 ~]# ethtool eth6
Settings for eth6:
Supported ports: [ FIBRE ]
Supported link modes: 10000baseT/Full
Supports auto-negotiation: No
Advertised link modes: 10000baseT/Full
Advertised pause frame use: No
Advertised auto-negotiation: No
Speed: 10000Mb/s
Duplex: Full
Port: FIBRE
PHYAD: 0
Transceiver: external
Auto-negotiation: off
Supports Wake-on: d
Wake-on: d
Current message level: 0x00000007 (7)
Link detected: yes
On KVM host, virtual interface used by the KVM guest to receive packets,
10Mbps
[root at rh188 ~]# ethtool eth6-client6
Settings for eth6-client6:
Supported ports: [ ]
Supported link modes:
Supports auto-negotiation: No
Advertised link modes: Not reported
Advertised pause frame use: No
Advertised auto-negotiation: No
Speed: 10Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 0
Transceiver: internal
Auto-negotiation: off
MDI-X: Unknown
Current message level: 0xffffffa1 (-95)
Link detected: yes
eth6 and eth6-client are virtually connected to the br6 bridge
[root at rh188 ~]# brctl show
bridge name bridge id STP enabled interfaces
br6 8000.90e2ba341e54 no eth6
eth6-client6
The l2fwd command running on the guest VM
100Mbps reported on l2fwd for a one port setup (receiving only)
/root/dpdk/dpdk-1.3.1r2/examples/l2fwd/build/l2fwd -c 3 -n 1 -b 000:00:03.0
-b 000:00:07.0 -b 000:00:0a.0 -b 000:00:09.0 -- -q 1 -p 1
the same (100Mbps) reported on l2fwd for a two ports setup (looping back
received traffic to the other port) too
/root/dpdk/dpdk-1.3.1r2/
examples/l2fwd/build/l2fwd -c 3 -n 1 -b 000:00:03.0 -b 000:00:07.0 -b
000:00:0a.0 -- -q 2 -p 3
Thanks
James
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