Date: Tue, 18 Mar 2014 14:41:19 +1000 From: Paul Koch <paul.koch137@gmail.com> To: stable@freebsd.org Subject: bsnmp HOST-RESOURCES.hrStorageSize odd value for real memory metrics Message-ID: <20140318144119.6b623341@speedy.akips.com>
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Hi, I have two quad core i5, 16G ram machines, running 10.0-Release and 9.2-Release. Both exhibit the same problem where a walk of the snmp object HOST-RESOURCES.hrStorageSize returns an unexpected value for its real memory metrics. This is a walk of one of the boxes... I've cut it down bit to fit.. ----------------------------------------------- walk 10.1.8.80 version 2 community public HOST-RESOURCES-MIB.host hrSystemUptime 0 TimeTicks 169459 hrSystemDate 0 DateAndTime 2014-03-18 13:49:23 +600 hrSystemInitialLoadDevice 0 Integer 0 hrSystemInitialLoadParameters 0 DisplayString /boot/kernel/kernel hrSystemNumUsers 0 Gauge32 1 hrSystemProcesses 0 Gauge32 100 hrSystemMaxProcesses 0 Integer 6164 hrMemorySize 0 Integer 16663744 hrStorageIndex 1 Integer 1 hrStorageIndex 2 Integer 2 hrStorageIndex 3 Integer 3 ... hrStorageType 1 ObjectIdentifier HOST-RESOURCES-TYPES.hrStorageRam hrStorageType 2 ObjectIdentifier HOST-RESOURCES-TYPES.hrStorageRam hrStorageType 3 ObjectIdentifier HOST-RESOURCES-TYPES.hrStorageVirtualMemory hrStorageType 4 ObjectIdentifier HOST-RESOURCES-TYPES.hrFSBerkeleyFFS hrStorageType 5 ObjectIdentifier HOST-RESOURCES-TYPES.hrFSOther hrStorageType 6 ObjectIdentifier HOST-RESOURCES-TYPES.hrFSBerkeleyFFS hrStorageType 7 ObjectIdentifier HOST-RESOURCES-TYPES.hrFSBerkeleyFFS hrStorageType 8 ObjectIdentifier HOST-RESOURCES-TYPES.hrFSNFS hrStorageType 9 ObjectIdentifier HOST-RESOURCES-TYPES.hrStorageRam ... hrStorageDescr 1 DisplayString Real Memory Metrics hrStorageDescr 2 DisplayString Shared Real Memory Metrics hrStorageDescr 3 DisplayString Swap:/dev/gpt/simulator-swap hrStorageDescr 4 DisplayString /, type: ufs, dev: /dev/gpt/simulator-root0 hrStorageDescr 5 DisplayString /dev, type: devfs, dev: devfs hrStorageDescr 6 DisplayString /alt, type: ufs, dev: /dev/gpt/simulator-roo= t1 hrStorageDescr 7 DisplayString /home, type: ufs, dev: /dev/gpt/simulator-ho= me hrStorageDescr 8 DisplayString /home/distfiles, type: nfs, dev: 10.1.8.20:/= home/distfiles ... hrStorageAllocationUnits 1 Integer 4096 hrStorageAllocationUnits 2 Integer 4096 hrStorageAllocationUnits 3 Integer 4096 hrStorageAllocationUnits 4 Integer 4096 hrStorageAllocationUnits 5 Integer 512 hrStorageAllocationUnits 6 Integer 4096 hrStorageAllocationUnits 7 Integer 4096 hrStorageAllocationUnits 8 Integer 512 hrStorageAllocationUnits 9 Integer 208 ... hrStorageSize 1 Integer 2319048 hrStorageSize 2 Integer 1593 hrStorageSize 3 Integer 1048544 hrStorageSize 4 Integer 1265407 hrStorageSize 5 Integer 2 hrStorageSize 6 Integer 1265407 hrStorageSize 7 Integer 238615252 hrStorageSize 8 Integer 1822049168 hrStorageSize 9 Integer 0 ... hrStorageUsed 1 Integer 2284267 hrStorageUsed 2 Integer 1462 hrStorageUsed 3 Integer 200 hrStorageUsed 4 Integer 814815 hrStorageUsed 5 Integer 2 hrStorageUsed 6 Integer 4 hrStorageUsed 7 Integer 2875148 hrStorageUsed 8 Integer 456220992 hrStorageUsed 9 Integer 89 ... hrStorageAllocationFailures 1 Counter32 0 hrStorageAllocationFailures 2 Counter32 0 hrStorageAllocationFailures 3 Counter32 0 hrStorageAllocationFailures 4 Counter32 0 hrStorageAllocationFailures 5 Counter32 0 hrStorageAllocationFailures 6 Counter32 0 hrStorageAllocationFailures 7 Counter32 0 hrStorageAllocationFailures 8 Counter32 0 hrStorageAllocationFailures 9 Counter32 0 ------------------------------------------------- hrStorageSize extract from HOST-RESOURCES-MIB hrStorageSize OBJECT-TYPE SYNTAX Integer32 (0..2147483647) MAX-ACCESS read-write STATUS current DESCRIPTION "The size of the storage represented by this entry, in units of hrStorageAllocationUnits. This object is writable to allow remote configuration of the size of the storage area in those cases where such an operation makes sense and is possible on the underlying system. For example, the amount of main memory allocated to a buffer pool might be modified or the amount of disk space allocated to virtual memory might be modified." ::=3D { hrStorageEntry 5 } =46rom dmesg: real memory =3D 17179869184 (16384 MB) sysctl -a | grep physmem hw.physmem: 17063673856 The value for "hrStorageSize 1 Integer 2319048" should actually be something like 4194304 (ie. 16G/4096) Also, the value keeps changing as memory use changes, which is=20 actually the job for hrStorageUsed not hrStorageSize. We installed net-snmp on one of the boxes, and even though we have no confidence in net-snmp, it does appear to return the correct values for hrStorageSize. Looks like a bug somewhere in usr.sbin/bsnmpd/modules/snmp_hostres/ but I've only had a quick look and can't quite follow what is going on. Makes this part of the table fairly useless for monitoring. Paul. --=20 Paul Koch Brisbane, Australia (+10 GMT/UTC)
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