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

[Rahul Arora]

Hi Alex,

The platform which you are using for your performance testing is of how
many cores??

On Tue, Dec 9, 2014 at 10:45 PM, Alex Wang <alexw at nicira.com> wrote:

> Hey Rahul,
>
> The kernel version should not make a difference,
>
> I'm curious, since ovs-2.3.0 is multithreaded, not sure how do you measure
> the cpu usage to be 100%?
>
> Also, could you post the full `mpstat -P ALL` output, so we can see the
> distribution of cpu usage,
>
>
> Thanks,
> Alex Wang,
>
>
>
> On Tue, Dec 9, 2014 at 1:49 AM, Rahul Arora <rahul1991.arora at gmail.com>
> wrote:
>
>> 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 flow780.78.2581281.09810.02561.89810.05123.69410.0
>>> 10247.1910.015149.8849.98790009.89910.0
>>>
>>>
>>>
>>> *Frame Per Second view (unit: Frames/s):*
>>>
>>>    Linux Bridge,
>>> Frame Size1 flow128 flow78768057192901212882891218491122568220702460630
>>> 51276405812450201024797193119731815147891418138029000137491138581
>>>
>>>    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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