perfSONAR User Q&A and Other Discussion

[Joseph Bernard <>]

I used the -w option and got closer to 700Mb/s. I even put it at 64M to
see if it made a difference.  I decided to install CentOS 5.7 i386 and got
950Mb/s on both TCP and UDP, and the limit with the -w option is 256
Kbyte.  Now I'm not sure if PS-PS is slower or if CentOS 5.7 is less
accurate.


Thanks,
Joseph


 

On 2/13/12 5:13 PM, "Brian Tierney" 
<>
 wrote:

>
>Did you use the -w option with UDP?
>
>TCP autotunes, UDP does not, and to go fast UDP needs more buffer space
>than the default. 
>
>Try adding "-w 4M" to both sender and receiver.
>
>On Feb 13, 2012, at 1:35 PM, Joseph Bernard wrote:
>
>> I loaded 3.2.1.1 on 2 workstations and got 950Mb/s on TCP and 600Mb/s on
>> UDP tests.  They both have 1Gb/s cards.  I thought maybe the network
>>cards
>> weren't up to snuff, so I got 2 HP servers, loaded them up, and did the
>> same tests.  I got the same results.  The workstations/servers are
>> connected via crossover.  I even tried a brand new cable to be sure it
>> wasn't bad materials.
>> 
>> When I used my iMac and Macbook Pro from 2009 running Snow Leopard, I
>>was
>> able to get 800Mb/s running iperf.  Is there something I am missing?
>> 
>> 
>> Thanks,
>> Joseph Bernard
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>