[c-nsp] Network performance question - TCP Window issue?

[sledge121 at gmail.com]

I have seen this before, it's called bandwidth delay product and is linked to window size, let us know the tcp results after you have adjusted.


Sent from my iPad

On 29 Apr 2012, at 10:22, CiscoNSP_list CiscoNSP_list <cisconsp_list at hotmail.com> wrote:

> 
> 
> 
>> 
>> Did you run your iperf tests also with UDP? (The numbers don't look
>> like it.)
>> 
>> With TCP you won't see many drops on your switches, it will adjust - and
>> you will see less throughput.
>> 
>> With iperf available at all three sites I would run tests with UDP streams.
>> This won't find the maximum bandwith automatically, you have to set a
>> bandwidth for testing and see if you have any packet loss.
>> 
>> Keep in mind that your carrier might police on ethernet bandwidth,
>> iperf measures IP throuput.
> 
> Thanks Klaus - No, did not test with udp...here it is:
> (With 100M had too many drops - 80M was the best:)[  3] local xxx.xxx.73.54 port 45790 connected with xxx.xxx.65.2 port 5001[ ID] Interval       Transfer     Bandwidth[  3]  0.0-10.0 sec  95.4 MBytes  80.0 Mbits/sec[  3] Sent 68029 datagrams[  3] Server Report:[  3]  0.0-10.0 sec  95.4 MBytes  80.0 Mbits/sec  0.044 ms    1/68028 (0.0015%)[  3]  0.0-10.0 sec  1 datagrams received out-of-order
> So to be able to see similar performance with tcp, I will need to adjust tcp window correct?
> 
>                         
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