perfSONAR User Q&A and Other Discussion

["Lang, Michael" <>]

Hello,

 

I’ve been having trouble with a system running perfSONAR, specifically with the 10G NIC.  The system is a Dell PowerEdge R610 with an Intel X520 NIC installed into it.  The problem that I’m having is that with newer kernels there has been a consistent load of .5 on the system.  After troubleshooting this I found the load is likely from the kernel thread ‘events’ getting stuck in state ‘D’ (Uninterruptible sleep) often.  Looks like this from top:

 

   21 root      20   0     0    0    0 D  0.0  0.0   6:42.19 events/2

 

Another symptom (the one I first noticed) is that keystrokes are choppy through SSH – especially if events/0 is the one going to ‘D’.  If I pull the ixgbe driver from the system these problems go away. 

 

The last kernel that I had working that didn’t have this problem was:

 

2.6.32-504.16.2.el6.web100

 

The current kernel installed is:

 

2.6.32-573.1.1.el6.web100.x86_64

 

I’ve tried changing some available ixgbe parameters such as interrupts and flow director but it hasn’t helped.  The only parameter I’m currently running is to use unsupported transceivers, but I don’t believe that should cause this issue.

 

Has anyone else seen this?  Anyone know of a fix or anything I could try to help resolve it?

 

Thanks,

 

-          Mike