[ovs-discuss] Even with ovs-controller vswitchd is still heavily used

[jerry]

Whatever how many controller is used for ovs-vswitcd. When mounts of flows comes, the first packet of every flow will do upcall from kernel datapath module and be given to ovs-vswitchd process.Maybe then it's given to ovs controller.

That may be one reason why ovs-vswitchd is heavily used.

To this question, we can make ovs-vswitchd multi-threaded and extract the packet openflow handling and communication with controller as some worker thread. But there will be additional cost on sync issues.

On 2013/6/11 4:43, Jesse Gross wrote:
> ovs-vswitchd is not a controller.
> 
> On Sat, Jun 8, 2013 at 6:24 AM, kevin parker <kevin.parker092 at gmail.com> wrote:
>> i dont think ovs uses multiple controller at the same time,in my case both
>> were used.
>> i am looking for the reason as per man page in secure mode vswitchd will not
>> be used when connection to controller fails,but it does not says that when
>> the connection is working both controller will be used.
>>
>> Regards,
>> keve
>>
>> On Fri, Jun 7, 2013 at 10:17 PM, Ben Pfaff <blp at nicira.com> wrote:
>>>
>>> Why did you think that setting secure mode would not use ovs-vswitchd?
>>>
>>> On Fri, Jun 07, 2013 at 09:33:31PM +0530, kevin parker wrote:
>>>> I thought setting secure mode would not use ovs-vswitchd, but in my case
>>>> its using both ovs-controller and ovs-vswitchd
>>>> Regards,
>>>> Ananthakrishnan
>>>>
>>>>
>>>> On Fri, Jun 7, 2013 at 8:22 PM, Ben Pfaff <blp at nicira.com> wrote:
>>>>
>>>>> Why do use think it would make a difference?
>>>>>
>>>>> On Fri, Jun 07, 2013 at 08:16:52PM +0530, kevin parker wrote:
>>>>>> Can some one please clarify this,why ovs-vswitchd is used even in
>>>>>> secure
>>>>>> mode
>>>>>>
>>>>>>
>>>>>> On Thu, Jun 6, 2013 at 10:58 AM, kevin parker
>>>>>> <kevin.parker092 at gmail.com
>>>>>> wrote:
>>>>>>
>>>>>>> and with out controller and in standalone ovs-vswitchd is at ~80%
>>>>>>> for
>>>>> the
>>>>>>> same traffic.
>>>>>>>
>>>>>>> using
>>>>>>> *ovs-vsctl -V*
>>>>>>> ovs-vsctl (Open vSwitch) 1.4.2
>>>>>>> Compiled Nov 23 2012 12:41:37
>>>>>>>
>>>>>>> *ovs-controller -V*
>>>>>>> ovs-controller (Open vSwitch) 1.4.0+build0
>>>>>>> Compiled Feb 18 2013 13:13:22
>>>>>>> OpenFlow versions 0x1:0x1
>>>>>>>
>>>>>>>
>>>>>>> On Thu, Jun 6, 2013 at 10:28 AM, kevin parker <
>>>>> kevin.parker092 at gmail.com>wrote:
>>>>>>>
>>>>>>>> Mostly HTTP,
>>>>>>>>
>>>>>>>> For confirming bench marked Apache with ab, ovs-vswitchd reached
>>>>>>>> 100%
>>>>> and
>>>>>>>> ovs-controller 14%
>>>>>>>>
>>>>>>>> ovs-dpctl show at the time of benchmark
>>>>>>>>
>>>>>>>> system at xenbr0:
>>>>>>>> lookups: hit:55391 missed:966296 lost:0
>>>>>>>> flows: 0
>>>>>>>>  port 0: xenbr0 (internal)
>>>>>>>> port 3: vif2.1
>>>>>>>>  port 4: vif1.1
>>>>>>>>
>>>>>>>> Do i need to make any changes in ovs-controller.
>>>>>>>>
>>>>>>>> Thanks,
>>>>>>>> Kevin.
>>>>>>>>
>>>>>>>>
>>>>>>>> On Wed, Jun 5, 2013 at 9:56 PM, Ben Pfaff <blp at nicira.com> wrote:
>>>>>>>>
>>>>>>>>> On Wed, Jun 05, 2013 at 07:11:44PM +0530, kevin parker wrote:
>>>>>>>>>> Hi,
>>>>>>>>>>
>>>>>>>>>>      i have  ovs-controller with default setting
>>>>>>>>>> (ovs-controller
>>>>> -v
>>>>>>>>>> ptcp:6633).
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> on xenserver host with ovs
>>>>>>>>>>
>>>>>>>>>> *ovs-vsctl get-fail-mode xenbr0*
>>>>>>>>>> *secure*
>>>>>>>>>>
>>>>>>>>>> I set it to secure mode to test that host should not use
>>>>>>>>>> vswitchd
>>>>> for
>>>>>>>>> flows
>>>>>>>>>> and forward it to controller for generating flow .*
>>>>>>>>>> *
>>>>>>>>>>
>>>>>>>>>> *ovs-vsctl get-controller xenbr0*
>>>>>>>>>> *tcp:10.10.10.183:6633*
>>>>>>>>>> *
>>>>>>>>>> *
>>>>>>>>>> * ovs-dpctl show
>>>>>>>>>> *
>>>>>>>>>> *
>>>>>>>>>> hit:8560336 missed:1060122 lost:0
>>>>>>>>>> flows: 81
>>>>>>>>>> *
>>>>>>>>>>
>>>>>>>>>> where xenbr0 is an isolated bridge with no connection to host
>>>>>>>>> interfaces.
>>>>>>>>>> No other bridge is connected to this controller.
>>>>>>>>>> When i ping vms on same  host l can see  ovs-vswitchd using
>>>>>>>>>> 35%
>>>>> CPU.
>>>>>>>>>>
>>>>>>>>>> and ovs-controller almost 11% CPU and some times non
>>>>>>>>>> responsive ssh
>>>>>>>>> session
>>>>>>>>>> on hosts.
>>>>>>>>>
>>>>>>>>> What kind of trafffic do you have in your network?
>>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>
>>
>>
>>
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>> discuss at openvswitch.org
>> http://openvswitch.org/mailman/listinfo/discuss
>>
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