On Thu, Mar 5, 2015 at 7:37 AM, Bill Fenner <fen...@gmail.com> wrote:
> On Wed, Mar 4, 2015 at 11:51 AM, Thomas Besemer <thomas.bese...@gmail.com>
> wrote:
>
>> I am working with net-snmp 5.7.3, and will be using several Sub-Agents in
>> my project, with fairly large amounts of data. I have noted that issuing a
>> 'snmpbulkwalk' to Master Agent results in this broken down into GETNEXT
>> requests to the Sub-Agent. This results in a lot of network traffic, as
>> well as a tremendous number of context switches (everything running on same
>> host).
>>
>> Is there support in the Sub-Agent to accept GETBULK requests from the
>> Master? I have looked at the code, their appears to be some infrastructure
>> in place, but it is not clear to me if it is fully functional.
>>
>
>> More so, is there a means to configure the Master to send GETBULK
>> requests to the Sub-Agent?
>>
>
> This is something that I've been working on a little. Both of these are
> relatively small tweaks. However, the bigger problem is that while the
> subagent is processing the request, it's basically lost the scoping info
> that the master agent has sent it, and so the response from the subagent
> can include info from subtrees that the master didn't ask for. There's
> code in the subagent to handle this for getnext, and we could do the same
> for getbulk, except I was also concerned about the overhead of fetching
> this data within the subagent - I wanted to find a way to retain the
> scoping info while processing the request so that request processing could
> be stopped.
>
> I'd be happy to share what I have; if you're up for hacking too maybe we
> should create a branch on github?
>
>
>
Hi Bill -
I'd be more than happy to work with you on this, and perhaps do a github
branch so that when we get it working, we can generate a patch set for
review by community.
My early investigation shows that Sub-Agent Doesn't handle anything but
GETNEXT, per handle_subagent_response() - perhaps this can be confirmed? I
have not looked at Master side, so it seems to me part of this could be
updating handle_subagent_response() to at least return some data set, if
this makes sense, and then have Master send OID down in PDU, and deal with
return data. I am assuming that a return packet from a GETBULK should be a
complete data set?
>From what I can tell, a GETBULK PDU only contains OID, so any filtering
would have to be on Master side?
Any tips you can provide will help, happy to share back what I learn.
Thanks,
tom
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