[ovs-discuss] OVS bad performance on lower packet size

Alex Wang alexw at nicira.com
Fri Dec 5 23:34:41 UTC 2014


Hey Rahul,

Could you help confirm the following:

1. did you use vm or bare metal machine for testing?

2. how do you measure the cpu utilization of ovs and kernel bridge?


We ran some throughput tests, and we observed constant better
performance over the Linux bridge.

Below is a set of our own throughput test result using ovs branch-2.3.

Plateform:
Server Dell R620, running Ubuntu 14.04 (3.13.0-30-generic), NIC is Intel
X540.

Flow:
Single flow, "in_port=1,actions:output=2"

Traffic type:
- unidirectional TCP throughput using Spirent (1 flow and 128 flows).


*Throughput view (unit: Gbit/s):*

   Linux Bridge,
Frame Size1 flow128 flow780.6021.5121280.9812.1892561.8155.4335123.2525.299
10246.65810.015149.6849.98790009.92110.0

   OVS Branch-2.3:
Frame Size1 flow128 flow780.78.2581281.09810.02561.89810.05123.69410.01024
7.1910.015149.8849.98790009.89910.0



*Frame Per Second view (unit: Frames/s):*

   Linux Bridge,
Frame Size1 flow128 flow78768057192901212882891218491122568220702460630512
76405812450201024797193119731815147891418138029000137491138581

   OVS Branch-2.3:
Frame Size1 flow128 flow788928571053370712892729984459462568593864528985512
86805523496241024860881119731815148054128138029000137181138581


Thanks,
Alex Wang,

On Wed, Nov 26, 2014 at 10:35 PM, Rahul Arora <rahul1991.arora at gmail.com>
wrote:

> Hi Team,
>
> We are doing comparison of throughput and CPU consumption between OVS
> 2.3.0 and kernel bridge with different packet size.
>
> We are observing huge difference in performance. With frame size 64 and
> 128 bytes unidirectional traffic from port1 to port2 below are the numbers.
>
>
> *OVS 2.3.0 (Dual core with matching flow in kernel space, kernel 3.12)*
>
> * kernel bridge(Dual Core System, kernel 3.12) *  *FRAME SIZE* *Throughput
> unidirectional (Mbps)* *CPU Usage %* *VS* *FRAME SIZE* *Throughput (Mbps)* *CPU
> Usage %*  64 375 100 64 487 100  128 747 100 128 864 40  256 927 10 256
> 927 5  320 941 8 320 941 4  384 950 6 384 950 4  448 957 4 448 957 3  512
> 962 3 512 962 3  1024 980 1 1024 980 1  1500 986 1 1500 986 1
> We have matching flow in kernel space with in_port=1 and action=output:2
> and flow is matching in kernel space
>
> How we can improve the performance of OVS i.e. increasing the throughput
> and decrease CPU consumption with lower frame size.
>
> _______________________________________________
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> discuss at openvswitch.org
> http://openvswitch.org/mailman/listinfo/discuss
>
>
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