On 4/26/06, Chris Howells <[EMAIL PROTECTED]> wrote:
> Rob wrote:
>
> > How can I verify that a 1Gb/s network is indeed
> > operating at its optimal speed? I tried this:
>
> By transferring large amounts of data using a light-weight protocol
> (maybe FTP) and timing the amount of time it takes.
>
> Also various testing utilities, for instance ttcp.
>
> > [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
>
> This is a measure of latency only.
>
> For instance, I can easily get 10ms pings on 512kbit/sec ADSL. It can
> only transfer data at ~60 KB/sec though.
>
> I can get these values on a very lightly loaded 100Mbit/sec network:
>
> [EMAIL PROTECTED] ping 10.0.0.5
> PING 10.0.0.5 (10.0.0.5): 56 data bytes
> 64 bytes from 10.0.0.5: icmp_seq=0 ttl=128 time=0.844 ms
> 64 bytes from 10.0.0.5: icmp_seq=1 ttl=128 time=0.740 ms
>
> > 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
>
> Sounds like your 100Mbit/s network is very heavily loaded, you would
> expect ~1ms pings.
Please notice that he is transferring 65515 bytes, not 64 (Like you did)
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