Hello Net-SNMP Coders,
even though I'm not a subscribed user, I'd like to send you a coding related
question, which I kindly ask you to answer.
We're currently testing Net-SNMP on HP-UX 11.31. Therefore we installed a
compiled net-snmp package from HP (version 5.6.1.1 as part of the HP Internet
Express Bundle A.19). When querying interface related information (OID's below
IF-MIB::ifEntry, .1.3.6.1.2.1.2.2.1), we're getting very long response times in
certain situations. Here is an example:
# time snmpget -v 2c -c public <hostname> .1.3.6.1.2.1.2.2.1.2.1
IF-MIB::ifDescr.1 = STRING: lan0 HP PCIe 1000Base-T Release B.11.31.1203
real 0.4
user 0.0
sys 0.0
# time snmpget -v 2c -c public <hostname> .1.3.6.1.2.1.2.2.1.2.55
IF-MIB::ifDescr.55 = STRING: software loopback
real 2.2
user 0.0
sys 0.0
In fact the higher the index of the interface in question the longer it takes
the snmpd to answer the request. We then traced the operating system calls of
the snmpd during such requests and we saw the following behavior.
- It seems, that at each such request, the snmpd first queries lots of
interface related information from the operating system before actually
answering the request.
- Even worse it seems, that the snmpd not only queries the interface
related information for the interface in question but for all interfaces with
an index lower and equal to the one in question. For example if we query the
interface name for interface number 55, then the snmpd seems to query the
interface related information for interfaces 1 - 55, before answering the
request. Hence the higher the index of the interface in question the more
effort and time it takes the snmpd to answer the request.
Just to give you a feeling about the consequences: A walk through the
IF-MIB::ifEntry (.1.3.6.1.2.1.2.2.1) subtree, which is expected to finish in a
few seconds, takes about 30 mins!
You certainly wonder, why we have 55 interfaces on our system. This is a
"feature" of the HP Auto Port Aggregation software for bonding network
interfaces, which is installed by default for HP-UX 11.31. It creates lots of
logical network interface called lan9xx, which are mostly unconfigured but find
their way into the interface related MIB tables.
Now my questions:
- Can you confirm my findings related to the behavior of the snmpd?
- Is there a way to speed up the snmpd in how it answers such
interface related requests?
Thanks for a short reply and kind regards,
Andre Fröbel from Germany!
Telefon: +49 385/4800-337
E-Mail: a.froe...@dvz-mv.de<mailto:a.froe...@dvz-mv.de>
Internet: www.dvz-mv.de<../Anwendungsdaten/Microsoft/Signatures/www.dvz-mv.de>
P E-Mails sparen Zeit und Geld, sie nicht auszudrucken spart Bäume.
_____________________________________
DVZ Datenverarbeitungszentrum
Mecklenburg-Vorpommern GmbH
Lübecker Str. 283 - 19059 Schwerin
Sitz der Gesellschaft: Schwerin - Eintrag im Handelsregister: HRB 187 /
Amtsgericht Schwerin
Geschäftsführer: Hubert Ludwig - Aufsichtsratsvorsitzender: Staatssekretär
Peter Bäumer
_____________________________________
------------------------------------------------------------------------------
Everyone hates slow websites. So do we.
Make your web apps faster with AppDynamics
Download AppDynamics Lite for free today:
http://p.sf.net/sfu/appdyn_d2d_feb
_______________________________________________
Net-snmp-coders mailing list
Net-snmp-coders@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/net-snmp-coders
