perfSONAR User Q&A and Other Discussion

[Dave Leibfritz <>]

We are still getting incorrect S2C numbers for 10 gigabit ethernet:

TCP/Web100 Network Diagnostic Tool v3.6.5.2
Click START to start the test

** Starting test 1 of 1 **
Connecting to 'prfsnr-prism.aps.anl.gov' 
[prfsnr-prism.aps.anl.gov/164.54.56.9] to run test
Connected to: prfsnr-prism.aps.anl.gov--  Using IPv4 address
Checking for Middleboxes  . . . . . . . . . . . . . . . . . .  Done.
Checking for firewalls . . . . . . . . . . . . . . . . . . .  Done.
running 10s outbound test (client-to-server [C2S]) . . . . . 5417.36Mb/s
running 10s inbound test (server-to-client [S2C]) . . . . . . 
-1592805.18kb/s
Sending META information . . . . . . . . . . . . . . . . . . . Done.
The slowest link in the end-to-end path is a  10 Gbps 10 Gigabit 
Ethernet/OC-192 subnet
 [S2C]: Packet queueing detected


On 08/15/2013 03:15 PM, Aaron Brown wrote:
> Would you folks be able to test out some newer NDT RPMs? They've been lightly 
> tested by me (i.e. i got a couple successful tests out of them :))
>
> You can grab the RPMs from 
> http://ndb1.internet2.edu/~aaron/ndt-3.6.5.2-rc4.i386/
>
> Download the ndt-server and ndt-client RPMs, and then do:
>
> yum localinstall ndt-client-3.6.5.2-rc4.el5.centos.i386.rpm 
> ndt-server-3.6.5.2-rc4.el5.centos.i386.rpm
>
> You'll need to restart NDT after that by doing /etc/init.d/ndt restart
>
> Cheers,
> Aaron
>
> On Aug 15, 2013, at 2:58 PM, Joseph Bernard 
> <>
>   wrote:
>
> > That would explain my results when I tried it on a workstation with a 10G 
> > card.
> >
> > client-to-server   5656.09Mb/s
> > server-to-client   -599769.5kb/s
> >
> >
> > Thanks,
> > Joseph B.
> >
> >
> > On Aug 15, 2013, at 2:31 PM, David Leibfritz 
> > <>
> > wrote:
> >
> > > I have been informed the NDT version 3.6.5.2 has a bug in the code recently
> > > where the S2C byte counter was set to an 32 bit int value.  At 10 Gbps rates
> > > this overflows with the obvious results.  When will perfSONAR get updated with
> > > the NDT version that has this bug fix?

--

----------------------------------------------------------------------
David W. Leibfritz                          Phone:    (630) 252-9276
Accelerator Engineering Support Division    Email: 

Argonne National Laboratory                 Fax:      (630) 252-6123
9700 South Cass Ave.                        Location: 401-C2244
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