perfSONAR User Q&A and Other Discussion

[Daniel Doyle <>]

Hi Joon,

Sorry to hear about that. A couple of questions / debugging ideas:

- Are you seeing this in both directions?
- Have you tried using the same port with a different device?
- If you're using / not using jumbo frames has the device been configured 
accordingly?

fwiw, I did not apply any tunings out of the box on a LIVA X and got >900Mbps 
on a local network. It's possible some of those tunings might not be 
appropriate for a machine like that, but I have't dug into it.

-Dan

> On Dec 22, 2015, at 11:58 AM, Hyojoon Kim 
> <>
>  wrote:
> 
> Hi all,
> 
> We decided to play with a LIVA X 2GB/32GB eMMC node with perfSONAR 3.5. 
> However, I am getting around 535Mbps instead of 940+Mbps when I initiate a 
> bwctl test to another local perfSONAR node we have. Between two Dell R610 
> servers with perfSONAR, we do get over 950Mbps, so it’s likely not a 
> network problem.
> 
> I have generally followed the instructions here 
> (http://docs.perfsonar.net/install_debian.html), and installed three 
> packages:
> apt-get install perfsonar-testpoint
> apt-get install perfsonar-toolkit-security
> apt-get install perfsonar-toolkit-sysctl
> 
> I also did the Linux Tuning, which is indicated here:
> http://fasterdata.es.net/host-tuning/linux/
> 
> Does anyone know what I am missing? I do have Ubuntu 14.04.3 Desktop OS on 
> this. Maybe switching to the well-tested Ubuntu 12.04 is better?
> 
> ===
> $ lsb_release -a
> No LSB modules are available.
> Distributor ID: Ubuntu
> Description:    Ubuntu 14.04.3 LTS
> Release:        14.04
> Codename:       trusty
> 
> $ uname -a
> Linux perfbox-livaxtest-01 3.19.0-39-generic #44~14.04.1-Ubuntu SMP Wed Dec 
> 2 10:00:35 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
> ===
> 
> Thanks,
> Joon

Dan Doyle
GlobalNOC Software Developer
1-812-856-3892

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