unable to disable 30sec. caching?

hello,
software we are developing monitors bandwidth of network interfaces every second. This works fine on freebsd machines with net-snmp 4.2.6, but on linux machines (debian4/net-snmp 5.2.3-7) every counter is being cached for 30 seconds. I am not sure what makes impact - OS or net-snmp version, so am applying for your help.

for unknown reasons the following command doesn't seems to have any effect:

snmpset -v 2c -c private localhost UCD-SNMP-MIB:versionClearCache.0 = 1

it returns no errors, verbose output shows the snmpd has successfuly been feeded with this but it has absolutely no efffect.
As far as I understand it should immediately update snmp counters with the fresh values instead of caching them for 30sec, at least man page says so:

"The agent caches the exit status and STDOUT of  the  exe-
cuted  program  for  30  seconds after the initial query.
This is to increase speed  and  maintain  consistency  of
information for consecutive table queries.  The cache can
be  flushed  by  a  snmp-set  request  of  integer(1)  to
1.3.6.1.4.1.2021.100.VERCLEARCACHE."

any ideas on solving this problem?

thank you

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