[Click] Click for measurement

[Eddie Kohler]

Hi Sandeep,

Thanks for these good questions!

A more current version of this configuration would look like this.


in0::InfiniteSource -> Queue
-> EtherEncap(0x0800, 11:22:33:44:55:66, 66:55:44:33:22:11)
-> Counter(COUNT_CALL 100 stop)
-> Print
-> tr :: TimeRange
-> Discard;

DriverManager(wait, print >- tr.interval, stop)


However, I've checked in some changes to the Git version so that "save 
tr.interval" will work again.

As for why 121 packets were sent, instead of 100: For performance reasons, a 
"stop" instruction does not immediately stop the router.  Rather, it enqueues 
a stop request, which stops the router soon afterwards.  If you wanted to 
immediately stop the InfiniteSource, you could do this instead:


in0::InfiniteSource -> Queue
-> EtherEncap(0x0800, 11:22:33:44:55:66, 66:55:44:33:22:11)
-> Counter(COUNT_CALL 100 finish.run)
-> Print
-> tr :: TimeRange
-> Discard;

finish :: Script(TYPE PASSIVE, print >- tr.interval, write in0.active false, stop)


Note how the "finish" script explicitly turns off the InfiniteSource and THEN 
stops the router.  Little Scripts that do multiple things are a quite useful 
technique for your toolbox.

However, over the weekend I figured out a way to speed up "stop" requests in 
many cases.  So if you update the Click sources from git, the *original* 
configuration will process 100 packets exactly as well.

Best,
Eddie


On 8/27/11 1:05 PM, sandeep wrote:
> Hi Guys,
>
> I am using a simple example from "click for measurement" paper and facing
> this error. Any ideas on how to correct it?
>
> in0::InfiniteSource ->  Queue
> ->  EtherEncap(0x0800, 11:22:33:44:55:66, 66:55:44:33:22:11)
> ->  Counter(COUNT_CALL 100 stop)
> ->  Print
> ->  tr :: TimeRange
> ->  Discard;
>
> DriverManager(wait, save tr.interval -, stop)
>
> ---
> countint.click:8: While configuring 'DriverManager at 8 :: DriverManager':
>    syntax error at 'save'
> Router could not be initialized!
> ---
>
> Also out of curiosity I want to know why the script is printing 121 packets
> instead of stopping at 100 (commented the DriverManager line in this case).
>
> Kind Regards,
> Sandeep,
> PhD Student,
> CTVR<http://ctvr.ie/>  - Trinity College Dublin
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