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

Rahul Arora rahul1991.arora at gmail.com
Tue Dec 9 09:49:58 UTC 2014


Hi Alex,

Thanks for your help.

I am using the following command to test CPU usage.

mpstat -P ALL 1

I was using 3.12 kernel version and you are using 3.13.0-30-generic
version.Please let me know if this can be the issue??



On Sat, Dec 6, 2014 at 5:04 AM, Alex Wang <alexw at nicira.com> wrote:

> 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 flow780.6021.5121280.9812.1892561.8155.4335123.252
> 5.29910246.65810.015149.6849.98790009.92110.0
>
>    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 flow788928571053370712892729984459462568593864528985
> 51286805523496241024860881119731815148054128138029000137181138581
>
>
> 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.
>>
>> _______________________________________________
>> discuss mailing list
>> discuss at openvswitch.org
>> http://openvswitch.org/mailman/listinfo/discuss
>>
>>
>
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