* Is the VM ethernet driver a para-virtual driver? Para-virtual drivers give a
good performance boost.
I have used openstack default parameters, it is virtio, I think virtio should
have a good performance:
<interface type='bridge'>
<mac address='fa:16:3e:ca:4a:86'/>
<source bridge='br-int'/>
<virtualport type='openvswitch'>
<parameters interfaceid='3213dbec-f2ea-462f-818b-e07b76a1752c'/>
</virtualport>
<target dev='tap3213dbec-f2'/>
<model type='virtio'/>
<address type='pci' domain='0x0000' bus='0x00' slot='0x03'
function='0x0'/>
</interface>
* Is TSO ON in the VM and the Hypervisor?
The VM:
Features for eth0:
rx-checksumming: off [fixed]
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: on
tcp-segmentation-offload: on
tx-tcp-segmentation: on
tx-tcp-ecn-segmentation: on
tx-tcp6-segmentation: on
udp-fragmentation-offload: on
generic-segmentation-offload: on
generic-receive-offload: on
large-receive-offload: off [fixed]
rx-vlan-offload: off [fixed]
tx-vlan-offload: off [fixed]
ntuple-filters: off [fixed]
receive-hashing: off [fixed]
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 [fixed]
rx-all: off [fixed]
The hypervisor:
Offload parameters for eth4:
rx-checksumming: on
tx-checksumming: on
scatter-gather: on
tcp-segmentation-offload: on
udp-fragmentation-offload: off
generic-segmentation-offload: on
generic-receive-offload: on
large-receive-offload: off
rx-vlan-offload: on
tx-vlan-offload: on
ntuple-filters: off
receive-hashing: on
* What throughput do you get while using Linux bridge instead of OVS?
Currently, I don't have a linux bridge environment.
But, I remember in virtio test, while I create bridge by hand and assigned it
to an instance, I can always get near hardware limitation bandwidth if I have
enough threads.
* Are you using tunnels? If you are using a tunnel like GRE, you will see a
throughput drop.
No, I'm working under Quantum+OVS+VLAN.
Thanks.
-chen
From: Gurucharan Shetty [mailto:[email protected]]
Sent: Tuesday, July 30, 2013 12:06 AM
To: Li, Chen
Cc: [email protected]
Subject: Re: [ovs-discuss] network bandwidth in Openstack when using OVS+VLAN
There could be multiple reasons for the low throughput. I would probably look
at the following.
* Is the VM ethernet driver a para-virtual driver? Para-virtual drivers give a
good performance boost.
* Is TSO ON in the VM and the Hypervisor?
* What throughput do you get while using Linux bridge instead of OVS?
* Are you using tunnels? If you are using a tunnel like GRE, you will see a
throughput drop.
On Mon, Jul 29, 2013 at 1:48 AM, Li, Chen
<[email protected]<mailto:[email protected]>> wrote:
Hi list,
I'm a new user to OVS.
I installed OpenStack Grizzly, and using Quantum + OVS + VLAN for network.
I have two compute nodes with 10 Gb NICs, and the bandwidth between them is
about 8.49 Gbits/sec (tested by iperf).
I started one instance at each compute node:
instance-a => compute1
instance-b=> compute2
The bandwidth between this two virtual machine is only 1.18 Gbits/sec.
Then I start 6 instances at each compute node:
( instance-a => compute1 ) ----- iperf------ > (instance-b=>
compute2)
( instance-c => compute1 ) ----- iperf------ >
(instance-d=> compute2)
( instance-e => compute1 ) ----- iperf------ >
(instance-f=> compute2)
( instance-g => compute1 ) ----- iperf------ >
(instance-h=> compute2)
( instance-i => compute1 ) ----- iperf------ >
(instance-j=> compute2)
( instance-k => compute1 ) ----- iperf------ >
(instance-l=> compute2)
The total bandwidth is only 4.25 Gbits/sec.
Anyone know why the performance is this low ?
Thanks.
-chen
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