Re: FreeBSD SNMP OID Question
In the last episode (Sep 18), Mark Saad said:
On Tue, Sep 17, 2013 at 2:11 PM, Dan Nelson dnel...@allantgroup.com wrote:
In the last episode (Sep 17), Mark Saad said:
Can someone shed some light on a OID mystery I have. I am using
cacti to trend some snmp data off a bunch of FreeBSD servers.
I noticed someone added a graph to a cluster for UCDavis - ssRawSwapIn /
UCDavis - ssRawSwapOut . The OIDs are .1.3.6.1.4.1.2021.11.62 /
.1.3.6.1.4.1.2021.11.63 Their description is Number of blocks swapped
in / Number of blocks swapped out .
# snmpwalk -c MyPassword -v2c -Of server00 .1.3.6.1.4.1.2021.11.62.0
.iso.org.dod.internet.private.enterprises.ucdavis.systemStats.ssRawSwapIn.0
= Counter32: 3588
That's a counter, so it's reporting the total number of pageins since
boot (or since snmp started, depending on the particular value you're
fetching). Cacti should be able to poll that OID and graph the
difference over time to show pageins/sec.
I guess to better refine the question , what is raw swap vs the sysctl
vm.stats.vm.v_swappgs{out/in} . I see that net-snmpd has ssSwapOut and
ssRawSwapOut . where raw is the current value and cooked
(ssswap{out/in}) is the average value . I am just at a loss when I am
trying to debug this graph issue as the cooked oid returns negative ints
and the raw returns positive ints, but the sysctrls and top show no usage
?
Has anyone seen this before ?
I don't know. I would have expected that ssRawSwapIn and ssRawSwapOut would
have mapped directly to the sysctls vm.stats.vm.v_swappgsout
vm.stats.vm.v_swappgsin, but apparently they don't. It's probably a bug in
net-snmp; the vm stats code is pretty hairy due to having to support every
version of every Unix out there, and no standard API for fetching stats like
this.
The values don't match on any of my systems, either.
$ sysctl vm.stats.vm | grep swappgs
vm.stats.vm.v_swappgsout: 1088669
vm.stats.vm.v_swappgsin: 85576
$ snmpget localhost ssRawSwapOut.0 ssRawSwapIn.0
enterprises.ucdavis.systemStats.ssRawSwapOut.0 = Counter32: 115135
enterprises.ucdavis.systemStats.ssRawSwapIn.0 = Counter32: 5671
--
Dan Nelson
dnel...@allantgroup.com
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Re: FreeBSD SNMP OID Question
On Tue, Sep 17, 2013 at 2:11 PM, Dan Nelson dnel...@allantgroup.com wrote:
In the last episode (Sep 17), Mark Saad said:
Can someone shed some light on a OID mystery I have. I am using cacti
to trend some snmp data off a bunch of FreeBSD servers.
I noticed someone added a graph to a cluster for UCDavis - ssRawSwapIn /
UCDavis - ssRawSwapOut . The OIDs are .1.3.6.1.4.1.2021.11.62 /
.1.3.6.1.4.1.2021.11.63 Their description is Number of blocks swapped
in / Number of blocks swapped out .
# snmpwalk -c MyPassword -v2c -Of server00 .1.3.6.1.4.1.2021.11.62.0
.iso.org.dod.internet.private.
enterprises.ucdavis.systemStats.ssRawSwapIn.0
= Counter32: 3588
That's a counter, so it's reporting the total number of pageins since boot
(or since snmp started, depending on the particular value you're fetching).
Cacti should be able to poll that OID and graph the difference over time to
show pageins/sec.
--
Dan Nelson
dnel...@allantgroup.com
Dan
I guess to better refine the question , what is raw swap vs the sysctl
vm.stats.vm.v_swappgs{out/in} . I see that net-snmpd has ssSwapOut and
ssRawSwapOut . where raw is the current value and cooked (ssswap{out/in})
is the average value . I am just at a loss when I am trying to debug this
graph issue as the cooked oid returns negative ints and the raw returns
positive ints, but the sysctrls and top show no usage ?
Has anyone seen this before ?
--
mark saad | nones...@longcount.org
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Re: FreeBSD SNMP OID Question
In the last episode (Sep 17), Mark Saad said: Can someone shed some light on a OID mystery I have. I am using cacti to trend some snmp data off a bunch of FreeBSD servers. I noticed someone added a graph to a cluster for UCDavis - ssRawSwapIn / UCDavis - ssRawSwapOut . The OIDs are .1.3.6.1.4.1.2021.11.62 / .1.3.6.1.4.1.2021.11.63 Their description is Number of blocks swapped in / Number of blocks swapped out . # snmpwalk -c MyPassword -v2c -Of server00 .1.3.6.1.4.1.2021.11.62.0 .iso.org.dod.internet.private. enterprises.ucdavis.systemStats.ssRawSwapIn.0 = Counter32: 3588 That's a counter, so it's reporting the total number of pageins since boot (or since snmp started, depending on the particular value you're fetching). Cacti should be able to poll that OID and graph the difference over time to show pageins/sec. -- Dan Nelson dnel...@allantgroup.com ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to freebsd-hackers-unsubscr...@freebsd.org
FreeBSD SNMP OID Question
All Can someone shed some light on a OID mystery I have. I am using cacti to trend some snmp data off a bunch of FreeBSD servers. I noticed someone added a graph to a cluster for UCDavis - ssRawSwapIn / UCDavis - ssRawSwapOut . The OIDs are .1.3.6.1.4.1.2021.11.62 / .1.3.6.1.4.1.2021.11.63 Their description is Number of blocks swapped in / Number of blocks swapped out . The mystery is the graphs show pages swapping in and out all the time. However the sysctls for swap usage show no indication of swap being used # sysctl -a |fgrep -i swap vm.swap_enabled: 1 vm.nswapdev: 1 vm.swap_async_max: 4 vm.swap_idle_threshold2: 10 vm.swap_idle_threshold1: 2 vm.stats.vm.v_swappgsout: 0 vm.stats.vm.v_swappgsin: 0 vm.stats.vm.v_swapout: 0 vm.stats.vm.v_swapin: 0 vm.disable_swapspace_pageouts: 0 vm.defer_swapspace_pageouts: 0 vm.swap_idle_enabled: 0 # uptime 2:51PM up 203 days, 22:29, 1 user, load averages: 0.00, 0.01, 0.00 # snmpwalk -c MyPassword -v2c -Of server00 .1.3.6.1.4.1.2021.11.62.0 .iso.org.dod.internet.private. enterprises.ucdavis.systemStats.ssRawSwapIn.0 = Counter32: 3588 I am using net-snmp-5.4.2.1 on FreeBSD 9.1-RELEASE amd64 See *http://net-snmp.sourceforge.net/docs/mibs/ucdavis.html -- mark saad | nones...@longcount.org ___ freebsd-hackers@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-hackers To unsubscribe, send any mail to freebsd-hackers-unsubscr...@freebsd.org
