Re: Frequency of ifOutOctets stats???

net-SNMP is design with a cache principle to avoid
polling the system when a user perform a walk of the
MIB tree.

the value in seconds depend of the coder of the
particular MIB that you look.

It's why you read the same value for a while and after
the cache timeout the value is update.

You can recompile net-SNMP with a smaller cache for
this particular MIB, but a system performance impact
can occur.

Bonne chance,

Dominique

--- Jean-Sebastien Morisset <[email protected]>
wrote:

> Hi everyone,
> 
> I have a little problem... I need to poll the value
> of ifOutOctets every
> few seconds, but Net-SNMP does not seem to keep this
> OID up to date. I
> wrote a little script to compare kstat with an
> snmpget of ifOutOctets
> and found Net-SNMP lagging behind. The following
> output shows the number
> of bytes transfered from one second to the next:
> 
> [root@boxsre2:~/tmp]
> # ./go
> Tue Sep 12 16:29:19 EDT 2006 : snmp , kstat
> Tue Sep 12 16:29:20 EDT 2006 : snmp 0, kstat 1714258
> Tue Sep 12 16:29:21 EDT 2006 : snmp 0, kstat 3090239
> Tue Sep 12 16:29:22 EDT 2006 : snmp 0, kstat 1473948
> Tue Sep 12 16:29:23 EDT 2006 : snmp 0, kstat 1572216
> Tue Sep 12 16:29:25 EDT 2006 : snmp 0, kstat 1808569
> Tue Sep 12 16:29:26 EDT 2006 : snmp 0, kstat 1625163
> Tue Sep 12 16:29:27 EDT 2006 : snmp 0, kstat 1818923
> Tue Sep 12 16:29:28 EDT 2006 : snmp 0, kstat 1745207
> Tue Sep 12 16:29:29 EDT 2006 : snmp 0, kstat 1531445
> Tue Sep 12 16:29:30 EDT 2006 : snmp 0, kstat 1469064
> Tue Sep 12 16:29:31 EDT 2006 : snmp 0, kstat 3248933
> Tue Sep 12 16:29:32 EDT 2006 : snmp 0, kstat 1513737
> Tue Sep 12 16:29:33 EDT 2006 : snmp 0, kstat 1422405
> Tue Sep 12 16:29:34 EDT 2006 : snmp 0, kstat 1877322
> Tue Sep 12 16:29:35 EDT 2006 : snmp 0, kstat 1480976
> Tue Sep 12 16:29:37 EDT 2006 : snmp 38405473, kstat
> 1366733
> Tue Sep 12 16:29:38 EDT 2006 : snmp 0, kstat 1649049
> Tue Sep 12 16:29:39 EDT 2006 : snmp 0, kstat 1596821
> Tue Sep 12 16:29:40 EDT 2006 : snmp 0, kstat 3106054
> Tue Sep 12 16:29:41 EDT 2006 : snmp 0, kstat 1452236
> Tue Sep 12 16:29:42 EDT 2006 : snmp 0, kstat 1474632
> Tue Sep 12 16:29:43 EDT 2006 : snmp 0, kstat 1391611
> Tue Sep 12 16:29:44 EDT 2006 : snmp 0, kstat 1618906
> Tue Sep 12 16:29:45 EDT 2006 : snmp 0, kstat 1447613
> Tue Sep 12 16:29:46 EDT 2006 : snmp 0, kstat 1531096
> Tue Sep 12 16:29:47 EDT 2006 : snmp 0, kstat 1612960
> Tue Sep 12 16:29:49 EDT 2006 : snmp 0, kstat 1696776
> Tue Sep 12 16:29:50 EDT 2006 : snmp 0, kstat 3293827
> Tue Sep 12 16:29:51 EDT 2006 : snmp 0, kstat 1700491
> Tue Sep 12 16:29:52 EDT 2006 : snmp 0, kstat 1521244
> Tue Sep 12 16:29:53 EDT 2006 : snmp 0, kstat 1395066
> Tue Sep 12 16:29:54 EDT 2006 : snmp 0, kstat 1520107
> Tue Sep 12 16:29:55 EDT 2006 : snmp 0, kstat 1495667
> Tue Sep 12 16:29:56 EDT 2006 : snmp 0, kstat 1576788
> Tue Sep 12 16:29:57 EDT 2006 : snmp 0, kstat 1549169
> Tue Sep 12 16:29:58 EDT 2006 : snmp 0, kstat 2993925
> Tue Sep 12 16:29:59 EDT 2006 : snmp 0, kstat 1712793
> Tue Sep 12 16:30:01 EDT 2006 : snmp 0, kstat 1605770
> Tue Sep 12 16:30:02 EDT 2006 : snmp 0, kstat 1523905
> Tue Sep 12 16:30:03 EDT 2006 : snmp 0, kstat 1283011
> Tue Sep 12 16:30:04 EDT 2006 : snmp 42570989, kstat
> 821472
> Tue Sep 12 16:30:05 EDT 2006 : snmp 0, kstat 908148
> Tue Sep 12 16:30:06 EDT 2006 : snmp 0, kstat 509385
> Tue Sep 12 16:30:07 EDT 2006 : snmp 1806619, kstat
> 389086
> Tue Sep 12 16:30:08 EDT 2006 : snmp 0, kstat 70395
> Tue Sep 12 16:30:09 EDT 2006 : snmp 0, kstat 23384
> 
> Here's the simple script I wrote to display these
> results:
> 
> #!/bin/sh
> while :
> do
>         snmp_bytes="`snmpget localhost
> .1.3.6.1.2.1.2.2.1.16.3 2>/dev/null | sed 's/^.*:
> \([0-9]*\)$/\1/'`"
>         [ "$snmp_last" ] && snmp_change="`expr
> $snmp_bytes - $snmp_last`"
>         snmp_last="$snmp_bytes"
> 
>         kstat_bytes="`kstat -p
> bge:1:bge1:obytes64|sed -n
> 's/^[a-z0-9:]*[^0-9]*\([0-9]*\)$/\1/p'`"
>         [ "$kstat_last" ] && kstat_change="`expr
> $kstat_bytes - $kstat_last`"
>         kstat_last="$kstat_bytes"
> 
>         echo "`date` : snmp $snmp_change, kstat
> $kstat_change"
>         sleep 1
> done
> 
> 
> Does anyone know how I can get Net-SNMP to return
> accurate
> second-by-second stats for ifOutOctets?
> 
> Thanks,
> js.
> -- 
> Jean-Sebastien Morisset, Sr. UNIX Administrator
> <[email protected]>
> Personal Home Page <http://jsmoriss.mvlan.net/>
> Underwater and Travel Photographs
> <http://www.mvpix.com/>
> 
>
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