[SNMP4J] 1 sec to send a pdu with SnmpRequest

[Parhar, Ajeet S]

Hi Jason,

I had this problem a little while back except that it appeared
intermittently. Sometimes it's took a few milliseconds to send a UDP
TRAP, but every now and again it took 1000ms plus a few milliseconds to
send. The problem appeared over Windows XP and Linux.

Some investigation and I discovered that if getting the socket resource
from the OS kernel fails for whatever intermittent reason, then the
error notification may not be provided for about 1000ms
(http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4667046)

Frank Fock's response on my request to this e-mail list was:

"Are you using a single Snmp instance with a single set of transport all
the time? If not, that's the problem." 

Which I wasn't because the code in org.snmp4j.tools.console.SnmpRequest
doesn't... In particular the send message creates a new session object
(via createSnmpSession()) per send.

public PDU send() throws IOException {
    Snmp snmp = createSnmpSession();
    ....

To solve the spurious 1000ms delay problem I created the session object
once and bound it to a class variable (plus make some other minor
changes to support the change).

I imagine this is common question and it'd be nice if the answer was
avaliable in a FAQ, or the mail list archives were more easily
searchable.

	Regards,

	- Ajeet.

-----Original Message-----
From: snmp4j-bounces at agentpp.org [mailto:snmp4j-bounces at agentpp.org] On
Behalf Of Jason Grant
Sent: Friday, 27 July 2007 5:03 PM
To: snmp4j at agentpp.org
Subject: [SNMP4J] 1 sec to send a pdu with SnmpRequest

I've written my test routines to confirm proper operation of my agent by
sending PDUs using org.snmp4j.tools.console.SnmpRequest.  Unfortunately,
the send method of this class is taking over 1 second to transmit and
receive a response, making table traversal very slow.  I have not
profiled this class, nor the agent, which is based on TestAgent. 

I'm a little concerned that the bottleneck may be in the agent itself,
rather than the client.  Tips about how to reduce the latency would be
appreciated, since if the sluggishness is in the agent, it may be a
little slow to use in our production environment.

Thanks,

Jason.

-----------------
Utiba Pty Ltd
This message has been scanned for viruses and dangerous content by Utiba
mail server and is believed to be clean.

_______________________________________________
SNMP4J mailing list
SNMP4J at agentpp.org
http://lists.agentpp.org/mailman/listinfo/snmp4j