[Orca-users] network vs. process swap

[Sean O'Neill]

At 08:33 AM 12/19/2002 -0700, Bruce Shaw wrote:

>My daily system overview for some of my systems shows "network", a red line,
>pinned at 4.0

This could be for several things.  You have a half-duplex interface 
?  Collisions will cause your network system overview line to spike 
somewhat like this as well retransmits and duplicate packets.  You need to 
look at your network related graphs to see what else is showing up.

>When I go to the individual graphs, there's nothing particularly interesting
>going on with the network.

Something is making Orca spike this.  Is your Orca page publicly accessible ?

>However, the "processes in Run Queue/Waiting/Swapped" is a sea of red.

This means:

- You are swapping now at some rate AND have processes already swapped out
- You had a swap out event in the past

Processes that swap out of memory stay swapped out until something wakes 
them up.  If you have processes swapped out that stay swapped out, that 
isn't a problem.  The problem is when you start swapping in and out and it 
adversely hits you performance overall.  I would start by reviewing this 
graph and see when the swap out event began.  Your free memory and page 
scanning graphs should show activity at this same time.  Then try to figure 
out what was going on at that time which may entail asking folks what they 
were doing at the time on that box.


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Sean O'Neill