How to verify speed of a 1Gb/s network?

[Peter Teuben]

i used a program called netperf,
 	http://www.netperf.org/netperf/NetperfPage.html
which i tested between a linux and macosx (G5) machine, they both had 1GB 
network cards,and i got around 50-70 MB/sec out of it, where 100 MB/s
would be roughly 1 Gb speed.

p.

On Tue, 25 Apr 2006, Rob wrote:

>
> Hi,
>
> How can I verify that a 1Gb/s network is indeed
> operating at its optimal speed? I tried this:
>
> [master]$ ping -s 65507 node
> 65515 bytes from node: icmp_seq=0 ttl=64 time=1.97 ms
> 65515 bytes from node: icmp_seq=1 ttl=64 time=1.95 ms
> 65515 bytes from node: icmp_seq=2 ttl=64 time=1.94 ms
> 65515 bytes from node: icmp_seq=3 ttl=64 time=1.97 ms
>
> (I tried many times, over a long period of time to
> get these typical values).
>> From this I conclude that it takes about 1.95 ms
> for 65515 x 8 bits to go forth and back between
> master and node.
>
> Ideally, on a 1Gbit/s network, the time should be:
>  65515 x 8 x 2 / (1024^3) = 0.98 ms
> (x 2 for the roundtrip signal forth and back
> and 1024^3 is the 1G of the network)
>
> May I now conclude that the real-time is about
> two times the ideal-time? I wonder if this indicates
> a problem of the network?
> And is this a proper test of this Gbit/s network?
>
> Thanks,
> Rob.
>
> PS: I verified my calculation method for two
> computers here on a 100Mbit/s network, from which
> I get:
>   time with ping: 12.4 ms
>   ideal calculated time: 10 ms
> which is an acceptable difference.
>
>
>
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