On Mon, 2006-01-16 at 21:05 +0200, Makavy, Erez (Erez) wrote:
> I think we got our definition mixed. I'll try again:
>
> - the MIB environment variable controls which MIBs (text files)
> will be parsed (when initializing snmp - init_snmp() )
> - the [--with-mib-modules, --with-out-mib-modules] tokes control which
> MIBs the master agent will initialize (I defined this as 'load').
Correct.
The fundamental difference is between loading MIB *files*
(used for translating between numeric OIDs and MIB object names),
and loading MIB *modules* (or "implementation modules") - the
code that actually implements a particular group of MIB objects.
These are two completely independent things.
> - I guess --with-mib-modules=ucdDemoPublic, will cause the
> master agent to call init_ucdDemoPublic()
>
> Right?
Right!
> Now.. more quesitons:
> 1) the --with-mib-modules do not affect sub-agents, right?
It depends :-)
It is perfectly possible to run the "main" Net-Snmp agent as an
AgentX subagent (using the -X) flag. In this case, it will load
the netsnmpmibs library as usual, which will attempt to register
the MIB modules as configured using --with{,-out}-mib-modules
But if the subagent was configured/compiled using
"net-snmp-configure --compile-subagent"
or something similar, then this will attempt to register
the MIB module(s) listed there, and the --with-{,out}-mib-modules
settings are completely irrelevant.
> 2) if MIBS environment variable is an empty string, are default
> MIBs still being parsed?
If the MIBS environment variable is set, then this replaces the
list of default MIBs. If it's set to an empty string, then no
MIBs should be parsed.
If it's not set at all (or starts/ends with '+'), then the
default list *will* be parsed.
> 3) Each Sub-agent takes ~600KB of RAM ( that is with MIBS set to
> empty string)
> a) Is the SHR (shared memory) amount a reasonable one?
> what is your estimate on the lowets amount possible?
No idea - I've had no experience working with embedded agents,
so I'm afraid that I've never really looked at the memory usage
characteristics.
> 4) To save disk space (in embedded system), could I cut down the
> size of the libraries? (I need them at run-time, right?)
I presume you've looked at the FAQ entries:
How can I reduce the memory footprint?
and
How can I reduce the installation footprint or speed up compilation?
Dave
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