[K12OSN] lbussd CPU usage?

Shawn Powers spowers at inlandlakes.org
Mon Jan 14 14:46:52 UTC 2008

I think lbussd is used for local devices, does that include sound  
cards?  I wonder if my old ISA sound cards might be responsible?  I'm  
trying to troubleshoot, but I'm not really sure what I should be  
looking for.

I did kill off all the lbussd processes this morning, and my servers  
started acting quite "peppy" again.  As people log in, however, the  
CPU draining processes are building up again.

Is there an intelligent way to troubleshoot?  In the words of  
LOLCats, I feel like, "I'm doin it rong"  :)

Thanks for any insight,

On Jan 10, 2008, at 11:42 AM, Shawn Powers wrote:

> On Jan 10, 2008, at 9:59 AM, Jim McQuillan wrote:
>> lbussd uses port 9202.  I'd try running tcpdump and watch that  
>> port, to see if there's some traffic.  It would be perfectly  
>> normal to see some packets when you plug a device into the client,  
>> or when you access data on a floppy or cdrom.  Other than that,  
>> there shouldn't be any traffic at all.
> I'm not seeing any traffic on port 9202 using:
> tcpdump -i eth0 port 9202
> I tried specifying a terminal, but when nothing showed up, I tried  
> leaving that out, to "sniff" for any port 9202 traffic.  I get  
> nothing after a few minutes of listening.  I still have a 5-6% CPU  
> usage on TONS of lbussd processes though.
> UPDATE: I just had a couple packets show up, but nothing that looks  
> abnormal.  I can send the results if you like, but it's just 3  
> packets.
> On my second server (not as slow, but still not "normal"), I have  
> about half a dozen lbussd processes, all using between 15-25% CPU.   
> The servers are running K12LTSP 6.0, and are configured similarly.   
> Perhaps I've configured something poorly...
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