[Click] Error in getting queue size

[Eddie Kohler]

Hi,

The queue will only grow if the input rates are greater than the output
CAPACITY. And this might not be the case; maybe iperf3 isn't generating
traffic as fast as you think. Counter can tell you the actually observed
input rates, as can Linux settings.

Eddie



On Wed, Jun 12, 2013 at 4:06 AM, llong_li <llong_li at 163.com> wrote:

> Dear all:
>
> I create a click element named AF to get the size of a queue element
> In the implementation file, I override the simple_action method as follows:
>
> Packet *
> simple_action(Packet *p) {
>        uint32_t _qlen = queue_size() ;
>       //and something else just as in the EtherSwitch element.
> }
> where the method queue_size is defined as follows:
> uint32_t
> queue_size() const{
>     if(_queue1){
>          if(_queue1->size() != 0)
>                click_chatter("_queue1->size: %d\n", _queue1->size());
>           return _queue1->size();
>     }
>     else{
>          int s = 0;
>          for(int i = 0; i < _queues.size(); i++)
>                s += _queues[i]->size();
>          return s;
> }
>
> I have a similar initialization like the RED element to initialize the
> _queues/_queue1 .
> And the configuration files is as follows:
> switch :: EtherSwitch;
> queue1 :: Queue
> queue2 :: Queue
> queue3 :: Queue
> queue4 :: Queue
> FromDevice(eth6, PROMISC true) -> [0]switch;
> FromDevice(eth7, PROMISC true) -> [1]switch;
> FromDevice(eth8, PROMISC true) -> [2]switch;
> FromDevice(eth9, PROMISC true) -> [3]switch;
>
> switch[0] -> AF -> queue1 -> ToDevice(eth6);
> switch[1] -> AF -> queue2 -> ToDevice(eth7);
> switch[2] -> AF -> queue3 -> ToDevice(eth8);
> switch[3] -> AF -> queue4 -> ToDevice(eth9);
>
>
> In my configuration, eth6~eth8 are connected to host 1, 2, 3, and 4
> I start iperf test (UDP)  on my servers, host 1 and 3 as the client and
> host2 as the server, none on host4.
> h1:   iperf3 -u -c h2 -b 1000m
> h3:   iperf3 -u -c h2 -b 1000m  -p 5202.
>
> The screen output that the queue size is 0, and sometimes 1.
>
> In my opinion, the queue's input rate is 2x larger than the output rate,
> so the queue size should increase continuous, util the queue overflow. But
> the screen output is different.
> Are there any wrong with configuration or implementation.
>
> Thanks.
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