I'm working on RDO, so:
the kernel is 2.6.32-358.114.1.openstack.el6.x86_64.
OVS is openvswitch.x86_64 1.10.0-1.el6
I have tried the same test on Ubuntu 12.04 perviously, the receive bandwidth is
not well too.
Also, in order to make sure we have OpenStack healthy running on CentOS, I
guess it might not a good choice to upgrade kernel.
I have tried directly enable VLAN on physical network port without OVS:
The bandwidth between two physical host can reach 9.38 Gbits/sec, looks like
kernel is working much better than OVS.
Thanks.
-chen
-----Original Message-----
From: Jesse Gross [mailto:je...@nicira.com]
Sent: Thursday, October 17, 2013 6:43 AM
To: Li, Chen
Cc: discuss@openvswitch.org
Subject: Re: [ovs-discuss] mod_vlan_id affect bandwith a lot
On Wed, Oct 16, 2013 at 2:27 AM, Li, Chen <chen...@intel.com> wrote:
> Hi list,
>
>
>
> I’m working on Openvswitch + Openstack.
>
>
>
> I tested the bandwidth between the virtual machine (host 1) and a
> physical machine (host 2).
>
>
>
> Physical machine - > virtual machine
> 2.92 Gbits/sec
>
>
>
> virtual machine - > Physical machine
> 7.31 Gbits/sec
>
>
>
> (The link between host 1 and host 2 is 10 Gbit/sec)
>
>
>
> After
>
> 1. Stop openvswitch-agent:
>
> service quantum-openvswitch-agent stop
>
> 2. removed flow rules on OVS bridge:
>
> ovs-ofctl del-flows br-eth4 in_port=17
>
> ovs-ofctl del-flows br-int in_port=5
>
> 3. removed VLAN tag for OVS port:
>
> ovs-vsctl clear port "qvo8fe2b20a-d3" tag
>
> ovs-vsctl clear port "qvo906d5a8c-c1" tag
>
>
>
> The network bandwidth between instance and a physical host reached 9.4 Gb/s.
>
> Physical machine - > virtual machine
> 9.40 Gbits/sec
>
>
>
> virtual machine - > Physical machine
> 9.39 Gbits/sec
>
>
>
> Looks like mod_vlan_id/add_vlan_id really affect bandwidth a lot.
>
>
>
> I want to get higher bandwidth under Openstack, especially for receive side.
>
> Anyone know how to tuning it ?
Usually VLAN problems are the result of loss of offloads or incompatibilities,
particularly on older kernels. What kernel and driver are you using?
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