it was also mentioned that 2.2 agent on the same system work as expected - could you please add some detail on that ? thanks 
Works fine on OpenBSD 3.9 (amd64, i386), 4.3 (amd64, i386), 4.7 (amd64, i386) and 5.4 (amd64, i386). Should be checked on OpenBSD 5.7.
OpenBSD 5.7 (amd64, i386) + zabbix 2.2.5 returns 0 as well
OpenBSD 5.5 (amd64, i386) + zabbix 2.2.5 returns correct values != 0
Seems the final version of OpenBSD 5.7 is not released yet. Let us wait the release!
Waiting for 5.7 won't help. I've tested with OpenBSD 5.7 (release, dated a mid March 2015).
Meanwhile, i've installed a fresh OpenBSD 5.6 + zabbix-agent 2.2.5 (package), see below.
Test with "openssl speed" running on that OpenBSD 5.6 machine
while true; do { zabbix_get -s CLIENT -I SERVER -k system.cpu.util; sleep 4; } done 0.297030 8.630363 15.297030 21.963696 28.630363 35.297030 43.630363 45.396040 (openssl speed stopped) 45.396040 45.396040 45.396040 45.396040 45.396040 45.396040 45.396040 40.099010 33.432343 26.765677 18.432343 ^C
Mark, did you encounter ZBX-9467 when building the agent for OpenBSD 5.7?
@Aleksandrs: No, i'm using OpenBSD packages only.
Fixed in svn://svn.zabbix.com/branches/dev/ZBX-9456
In OpenBSD 5.7 the header file sys/dkstat.h is not used anymore. The configure script disabled system.cpu.util check because this file was missing. In the proposed fix the missing header file was substituted with sys/sched.h file which has all the necessary definitions.
http://archives.neohapsis.com/archives/openbsd/2014-09/0367.html (or http://permalink.gmane.org/gmane.os.openbsd.tech/38389 with a better formatting) looks like an (semi-)official OpenBSD discussion regarding removing sys/dkstat.h.
(1) File sys/sched.h is present in many operating systems, see http://fxr.watson.org/fxr/source/sys/sched.h?v=NETBSD5 , and there it contains definitions that we do not need. Since we only need it on OpenBSD, why don't we include it only in cpustat.c for OpenBSD?
igorsh RESOLVED in r53644.
asaveljevs CLOSED
(2) configure.in is missing a space after "sys/sched.h".
igorsh RESOLVED in r53644.
asaveljevs CLOSED
(3) This is not necessarily a problem, but something to think about. Based on changes in development branch, we will now include both sys/dkstat.h and sys/sched.h, where present. On older systems, both of these files contain CP_USER and other definitions that we need for CPU collection. Due to https://gcc.gnu.org/onlinedocs/cpp/Undefining-and-Redefining-Macros.html , there is no warning, because macro values are effectively the same. Still, is it good?
igorsh RESOLVED in r53644.
In this fix sys/sched.h file is added only on OpenBSD platforms if sys/dkstat.h is not present.
asaveljevs Please take a look at r53692. It attempts to improve style a bit and adds an explanatory comment. Still RESOLVED.
igorsh Thank you. Looks good. CLOSED.
I've made the changes according to svn://svn.zabbix.com/branches/dev/ZBX-9456 but a freshly built zabbix package still shows 0.000000 when queried by the server (several hours after restarting zabbix_agentd)
The changes in development branch modify "configure.in". Have you run "bootstrap.sh" to regenerate "configure" script?
yes
Built a new package and with dropping sys/dkstat.h and including sys/sched.h in src/zabbix_agent/cpustat.c it works now on OpenBSD 5.7-current i386/amd64.Updated a few test machines and not a single 0.00000 the last 24 hours.
Available in 2.0.15rc1 r53765, 2.2.10rc1 r53766, 2.4.6rc1 r53768 and 2.5.0 (trunk) r53769.