[Click] some outputs from peak rate measurement, and questions

[gcalarco at deis.unibo.it]

Quoting Lan Xue <lanxue at soe.ucsc.edu>:

> Hi all,
> 
> Thanks for those who give me suggestions about measuring the peak packet 
> forwarding rates. The click router is installed on a PentiumIII machine 
> with 1.2GHz CPU and 1G memory. Because the for now, the 100Mb network 
> adapters are the bottleneck, I instead use InifiteSource as traffic 
> generator and Counter to collect the number of packets passed. Kernel 
> space 
> provides around 1.1M packets per sec, about twice as much as that provided 
> by user level click.
> 
> I tried 64Byte, 1kByte and 10KByte packet, but didn't observe any obvious 
> difference in forwarding rates between different packet sizes. Does that 
> imply that there's no upper bound for the number of bits passed through 
> the router per sec, given the number of the packets are not higher than 
> the peak rate?
> 

yes, you are not using the PCI bus at all, that's change
things a lot...
packet size does not matter at the click (software) level, since
what is passing through the click elements is a packet
pointer, not the packet itself. 

ciao
giorgio


> Next are the handlers printed out by PokeHandlers, running at user-level. 
> It was called in this way: PokeHandlers(read ctr.rate, read ctr.count, 
> read ctr.byte_count, read myqueue.drops, write ctr.reset, wait 1, loop); I 
> assumed that ctr.count should be close to ctr.rate if not exactly the 
> same, since there's no drops of packets from the queue. Also, I thought 
> ctr.count should be the product of ctr.byte_count and size in byte per 
> packet. However, neither is the case as I expected, as you can see from 
> below: 
> 
> ctr.rate:
> 518795.996
> 
> ctr.count:
> 743040
> 
> ctr.byte_count:
> 40867200
> 
> myqueue.drops:
> 0
>     
> ... more repeated prints, but with similar values as the above for each 
> handler.
> 
> Anyone has any ideas/comments/suggestions? 
> 
> Thanks a lot,
> 
> Lan
> 
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