perfSONAR User Q&A and Other Discussion

[Lincoln Bryant <>]

I should add that our UL kernel is actually a derivative of the UltraLight kernel, rather than UltraLight 'proper'. Specifically, we are running kernel 3.2.13 for performance reasons.

I had some relevant information for this, let me see if I can dig it up. 

--Lincoln

On Apr 1, 2014, at 1:38 PM, Shawn McKee wrote:

Both  'bwctl'  and 'owping'  want  to  have  the  local  clock  correctly synchronized.

What  does  ntptime  show  on  this  host?

What  about  'ntpq -p' ?

What  is  in /etc/ntp.conf ?

Lincoln, Is  there  something  you hit  with  the  UltraLight  kernel that  is  messing  up ntp?

Thanks,

Shawn

On Tue, Apr 1, 2014 at 2:35 PM, Hironori Ito <> wrote:

Hello.

do you know how to get around the issue of the following error when bwctl is run?

[root@uct2-s20 ~]# bwctl -T nuttcp -c aofa-pt1.es.net -f m -i 2 -x -t 100
bwctl: NTP: Status UNSYNC (clock offset problems likely)
bwctl: NTP is unsynchronized. Skipping test. Use -a to run anyway.

Lincoln stats that it has something to do with ultralight kernel?

Hiro