[SNMP4J] Timeouts and Retries behavior.

[Frank Fock]

Hello Varma,

The network and agent performance is decisive
for the optimal timeout/retry strategy.
With a non-default timeout model you can
further optimize the overall performance,
for example, by resending requests
with t=500ms after t/4,t/2,t instead of
after t,t,t which is the default for 3 retries.

Best regards,
Frank


varma datla wrote:
> Hello Frank,
> We are using SNMP4J 1.8.1 to query the SNMP agent and observed the following behavior with different timeouts/retries.
> 
> Requesting about 20 OIDs and processing responses asynchronously using simple implementations of ResponseListener and TreeListener (for WALK) interfaces appropriately. 
> 
> These timeouts and retries are being set on the CommunityTarget and snmp version is set to 1.
> 
> Retries      Timeout(ms)      Results
> -----------------------------------------------------------------
> 3               500                        100%..got all expected responses.
> 2               2000                  Lost some..mostly involving WALK.
> 1               5000                  Lost even more responses, WALK and the rest.
> 
> When observed using Wireshark, no response is being sent by the SNMP agent and I can see the expected retries and timeouts for the non-responsive OIDs.
> 
> More retries with lesser timeout is giving best results. Is this an expected behavior? Or could it be a network dependent scenario?
> 
> Also wondering, what would be the expected behavior if a TimeoutModel is set on the snmp instance and Timeouts/Retries are set on the Target? Which would be preferred during the communication?
> 
> I appreciate your time and effort.
> 
> Thanks,
> Varma.
> 
> 
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