[c-nsp] High IPC LC Message Header utilization

[David Coulson]

I've noticed weird CPU utilization on a 7513 recently upgraded to 
12.4(23) (AdvIP w/ SSH). The two top processes, by CPU usage, are these:

 103     5834624   9290243        628  2.78%  2.58%  2.50%   0 IPC LC 
Message H
   3     3708356  10387227        357  0.98%  0.87%  0.82%   0 IPC CBus 
process

Not exactly anything to get excited about, but that's ~4% CPU which 
wasn't in use last week. I compared it to another 7500 running the same 
code, which has very different CPU utilization for these processes:

 103        9492   2990653          3  0.00%  0.00%  0.00%   0 IPC LC 
Message H
  48     1319160   3539843        372  0.08%  0.15%  0.15%   0 IPC CBus 
process

The runtime on the IPC LC Message Header process is obviously way out of 
whack on the first one - Is there a way to track down what is causing 
this process to consume CPU? I had a quick look through the ipc sessions 
and queues, with nothing which would really account for such a 
difference in runtime.

Any idea where to look?