[c-nsp] 2950G-EI memory?

[Shaun]

I have many C2950G-48-EI's and the other day I could not gain telnet access 
to one of them and a few machines behind it where having issues getting to 
the world.  When plugging a console into it I received the following 
message...

%% Low on memory; try again later
Local Memory Statistics
Free = 40         Total = 3847808    Used = 3847768

The only way for me to fix the problem and get into the switch was to reboot 
it.  Traffic into the switch was only 5-6mbit also.  Today I started to add 
my 2950's into nagios so that I can monitor cpu and memory when I noticed 
that a few of the other 2950's showed 0 memory free..

Example from one of them...

               Head    Total(b)     Used(b)     Free(b)   Lowest(b) 
Largest(b)
Processor   80C8F980     3847808     3847808           0           0 
0
      I/O   A0A46540     2397216     1734352      662864      202368 
560432

Now i noticed that Processor shows 0 Free but I/O shows 662864 bytes free.

A sh proc mem on the same switch showed me the following...

Total: 6245024, Used: 5581072, Free: 663952

My question here is should proc mem free be 0? why is there all these 
different memory readings and which one should I pay attention to?  Also 
what's the best way to find whats eating the memory, sh mem displayed way to 
much stuff.  sh proc mem?

The OID's i'm using to monitor memory are 1.3.6.1.4.1.9.9.48.1.1.1.5.1 for 
used and 1.3.6.1.4.1.9.9.48.1.1.1.6.1 for free.  I was told these are for 
5min averages, which doesnt make much sense why you'd have a 5 min average 
on memory but if this is true, is their a real-time oid?

Thanks in advance.

~Shaun