[NCLUG] system hangs for 5-10 seconds every few minutes

[Daniel Herrington]

Bob,

I'm using ssh over a usb wireless 802.11b adapter. The embedded  
machine has 128MB of memory. I tried vmstat, and it shows 0 for both  
si and so. The top program is also pausing, and when I tried it with  
"top -b -d 1 | tee top.txt", the top.txt never showed more than about  
20% cpu usage by the user, and never more than about 11% by the  
system. A couple of processes that I'm wondering about are kjournald  
and NetworkManager. Maybe these are too resource-intensive for my  
measley Pentium 200 MMX single-board computer.

It would be nice if I could see how much cpu time all the processes  
on the system took over a given period of time.

Daniel


On Sep 1, 2007, at 11:52 AM, Bob Proulx wrote:

> Daniel Herrington wrote:
>> My embedded Debian box is hanging for 5-10 seconds every minute or  
>> two.
>
> How are you logging into this machine?  Are you using ssh?
>
> How much memory does your embedded machine have?
>
> Is it swapping?  Look at the si/so (swapin/swapout) fields here:
>
>   vmstat
>
>> Keystrokes don't even show up during this, and then they catch
>> up after the hang. It's getting really annoying. I tried running "top
>> -d 1" in another terminal, but since it does the same thing, I don't
>> think I'm seeing the problem process(es).
>
> The top program is also pausing at this same time?  Is the load
> average very high when it comes back?
>
>> What's the best way to go about debugging this?
>
> I admit that I don't know but more information would still be useful.
>
> Bob
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