[ovs-discuss] OVS 2.4 and 2.4 Flow deletion issue

Jarno Rajahalme jarno at ovn.org
Tue Apr 12 01:31:42 UTC 2016


I tried with a bit simpler flows, like this:

ovs-ofctl add-flow br-int hard_timeout=0,idle_timeout=0,priority=10,ip,cookie=0x$v,table=0,dl_vlan=$v,nw_src=9.16.$i.$j,actions=output:1

And while adding them one-by-one in my VM took 12 minutes (my dev VM has been very slow recently), the runtime of the deletion was not noticeable, i.e., a following flow dump returned right away. Deleting all 200 flows took maybe 2-3 seconds.

I’m trying again with the exact flow reported, but I’d be surprised if the additional match fields would make a difference.

This on tip of master. I’ll have to try again with releases 2.4 and 2.5.

  Jarno

> On Apr 11, 2016, at 5:15 PM, Jarno Rajahalme <jarno at ovn.org> wrote:
> 
> I’m looking into this,
> 
>  Jarno
> 
>> On Apr 11, 2016, at 3:41 PM, Ben Pfaff <blp at ovn.org> wrote:
>> 
>> Jarno, it seems likely that this has something to do with the
>> transactional classifier implementation.  Do you think so?  Do you have
>> any idea why deletions would be so slow?
>> 
>> Thanks,
>> 
>> Ben.
>> 
>> On Mon, Apr 11, 2016 at 09:51:45PM +0000, Maurya, Alok Kumar (HP Networking) wrote:
>>> Hi All,
>>> 
>>> I am  seeing that  in OVS  2.4 and  ovs 2.5   Bulk flow  deletion  is  taking  huge  time  more  than  (30 mins)  compared  to  ovs 2.3  where  it  used to  take  1-2  secs .
>>> 
>>> Below are steps  which I am  following to   reproduce the  issue :
>>> 
>>> 
>>> 1. Add  200K Flows
>>> 
>>> ####### Sample Script  to  add  200 K Flows   ######
>>> 
>>> 
>>> echo "Adding 200K Flows"
>>> date
>>> for v in {1..20}
>>> 
>>> do
>>> 
>>> for i in {1..250}
>>>  do
>>> 
>>>    for j in {1..40}
>>>      do
>>> 
>>>        ovs-ofctl add-flow br-int hard_timeout=0,idle_timeout=0,priority=10,ip,cookie=0x5c38cfa3a668$v,table=0,dl_dst=fa:16:3e:af:69:a3,dl_vlan=$v,nw_src=9.16.$i.$j/32,in_port=1,actions=output:1
>>> 
>>>      done
>>>  done
>>> 
>>> done
>>> date
>>> echo "Flows are added"
>>> 
>>> echo "Dump-Flows"
>>> ovs-ofctl dump-flows br-int |wc
>>> date
>>> 
>>> 
>>> ########   End  Script   ####
>>> 
>>> 
>>> 2. Try to delete  10 k Flows  ()
>>> 
>>> ovs-ofctl del-flows br-int dl_vlan=1
>>> 
>>> 3. Above  command  gets  executed  successfully , but  looks  like deletion keep on happening in background .
>>> 4.  It   takes  more  than  30  mins  to  complete it ,  during  this  period  if  anyone  executes any of  below  command  it  hangs  without any output .
>>> 
>>> 
>>> ovs-ofctl dump-flows br-int
>>> 
>>> or
>>> 
>>> ovs-ofctl show br-int
>>> 
>>> 
>>> 5.  This  issue  is not seen  in ovs 2.3
>>> 
>>> 
>>> Is  there any solution for  this  issue ?
>>> 
>>> 
>>> 
>>> 
>>> Thanks & Regards,
>>> Alok
>> 
>>> _______________________________________________
>>> discuss mailing list
>>> discuss at openvswitch.org
>>> http://openvswitch.org/mailman/listinfo/discuss
>> 
> 




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