[ovs-discuss] Polling Frequency

Joe Stringer joe at ovn.org
Tue Jan 19 18:32:32 UTC 2016


I suggest debugging, for instance by adding VLOG_INFO() statements at
different points in the code to understand when the revalidator thread
is gathering statistics, attributing them, and sleeping.

On 19 January 2016 at 04:13, Haleema Sadia <haleema.s.mahmood at gmail.com> wrote:
> Hi,
>
> So I changed the polling frequency interval in the function you mentioned (I
> re-did all the steps following updating ovs through mininet). However, the
> packet count changes after roughly 500 ms. Is there anywhere I can change
> that?
>
> I tried changing the polling frequency to 1ms, 0.1ms and 0.01 ms (in the
> function you mentioned) and the achieved frequency is roughly around 1ms but
> when I check the packet from the fetched flow stats, they change after 500
> ms. I have a long lived iperf flow which is running. Is there anything in
> the switch code which is limiting it?
>
>
> Thanks,
> Haleema
>
> On Wed, Dec 23, 2015 at 3:57 AM, Joe Stringer <joe at ovn.org> wrote:
>>
>> On 22 December 2015 at 04:31, Haleema Sadia Mahmood
>> <haleema.s.mahmood at gmail.com> wrote:
>> > Hi,
>> >
>> > I wanted to enquire that what is the polling frequency of the open
>> > vswitch for fetching the flow stats? Can you specify in the code where it is
>> > doing it?
>>
>> Roughly 1-2x per second:
>>
>> https://github.com/openvswitch/ovs/blob/master/ofproto/ofproto-dpif-upcall.c#L898
>
>



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