dummynet question

Dominic Marks dom at goodforbusiness.co.uk
Thu Aug 3 10:18:07 BST 2006


khoa phan wrote:
> Hello all,
> I'm currently using Dummynet (configured from FreeBSD
> 5.4). I have a broblem when using it: I'm using
> Dummynet and iperf to test throughput of TCP NewReno,
> when i configure as follow:
> ipfw add pipe 1 ip from any to any
> ipfw pipe 1 config bw 100Mbit/s
> -> throughput: 47.3 Mbit/s (why just as nearly half of
> 100Mbit/s ??)
>   
I'm guessing that would be because the in and out traffic is going via
the same dummynet pipe. So every packet is being counted twice.

Dominic
> ipfw pipe 1 config bw 0Mbit/s (no limit bw)
> -> throughput: 94.2Mbit/s
>
> My network model: PC - Dummynet - PC 
>                   all use 100Mbit ethenet card
>
> Any help is greatly appreciated!
>
>
>
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