Re: OpenBSD w/ DISMAN-EVENT-MIB swapError / memMinimumSwap

 	Okay per the grep below, the problem is in memory_netbsd1.c, 
which, given the name of the file, would explain a great deal of 
desynchronization between the kernel data structures and the state of the 
MIB data retrieval algorithm.  The logic is the line:

if (swapFree < minimumswap)
 	....blah

In FreeBSD, swapFree get's assigned

 	swapFree += kswap[i].ksw_total

But in OpenBSD (I'm assuming it uses the NetBSD #ifdef'd file), I don't 
really even see where swapFree is getting set.  Unless

 	long_ret = (swapFree > minimumswap) ? 0 : 1;

...bitwise operation is doing so.  But I doubt it.  I suspect the problem 
is persistent in NetBSD as well (CC'ing pkgsrc maintainer).  Also, I don't 
know how far apart the NetBSD and OpenBSD virtual memory systems have 
grown.


net-snmp-5.2.1.2/agent/mibgroup/ucd-snmp$ grep -ir swapFree ./*
./memory.c:       unsigned long *swapfree);
./memory.c:        swapfree;
./memory.c:           &swapfree);
./memory.c:       unsigned long *swapfree)
./memory.c:        b = strstr(buff, "SwapFree: ");
./memory.c:            sscanf(b, "SwapFree: %lu", swapfree);
./memory.c:            snmp_log(LOG_ERR, "No SwapFree line in 
/proc/meminfo\n");
./memory.c:            *swapfree = 0;
./memory.c:    swapfree
./memory.c:        case swapfree:
./memory.c:    spaceleft = memory(swapfree);
./memory.c:        long_ret = memory(memfree) + memory(swapfree);
./memory_freebsd2.c:quad_t          swapFree;
./memory_freebsd2.c:        sscanf(ext.output, "%*s%*d%qd%qd", &swapUsed, 
&swapFree);
./memory_freebsd2.c:        swapTotal = swapUsed + swapFree;
./memory_freebsd2.c:    swapUsed = swapTotal = swapFree = 0;
./memory_freebsd2.c:        swapFree += kswap[i].ksw_total - 
kswap[i].ksw_used;
./memory_freebsd2.c:    swapUsed = swapTotal - swapFree;
./memory_freebsd2.c:    swapFree *= pagesize;
./memory_freebsd2.c:        long_ret = swapFree;
./memory_freebsd2.c:        long_ret = (swapFree > minimumswap) ? 0 : 1;
./memory_freebsd2.c:        if (swapFree < minimumswap)
./memory_freebsd2.c:            sprintf(errmsg, "Running out of swap space 
(%qd)", swapFree);
./memory_netbsd1.c:quad_t          swapFree;
./memory_netbsd1.c:        long_ret = (swapFree > minimumswap) ? 0 : 1;
./memory_netbsd1.c:        if (swapFree < minimumswap)
./memory_netbsd1.c:            sprintf(errmsg, "Running out of swap space 
(%qd)", swapFree);



On Mon, 15 Aug 2005, Brian A. Seklecki wrote:

>
> [with the correct address list this time]
>
> All:
>
> Another issue with OpenBSD.  Using the 'defaultMonitor' config with OpenBSD 
> 3.7/i386 running Net-SNMP 5.2.1p1.  At agent restart, I always get a trap 
> from the agent about swap:
>
> example:
>
> Jul 25 08:49:01 nmsHostname snmptrapd[72648]: 2005-07-25 08:49:01 
> hostname.com [UDP: [192.168.1.1]:45160]: DISMAN-EVENT-MIB::sysUpTimeInstance 
> = Timeticks: (40857874) 4 days, 17:29:38.74 SNMPv2-MIB::snmpTrapOID.0 = OID: 
> DISMAN-EVENT-MIB::mteTriggerFired DISMAN-EVENT-MIB::mteHotTrigger = STRING: 
> memory DISMAN-EVENT-MIB::mteHotTargetName = STRING: 
> DISMAN-EVENT-MIB::mteHotContextName = STRING: DISMAN-EVENT-MIB::mteHotOID = 
> OID: UCD-SNMP-MIB::memSwapError.0 DISMAN-EVENT-MIB::mteHotValue = INTEGER: 1 
> UCD-SNMP-MIB::memErrorName.0 = STRING: swap UCD-SNMP-MIB::memSwapErrorMsg.0 =
> STRING: Running out of swap space (0)
>
>
> I'm not sure where DISMAN-EVENT-MIB is pulling information about swap 
> (sysctl? kernel? userland?), but it's erroneous in this case.
>
>
> # swapctl  -l
> Device      1K-blocks     Used    Avail Capacity  Priority
> /dev/raid0a   2097024        0  2097024     0%    0
>
> In UCD-SNMP-MIB.txt, the following is defined:
>
> memMinimumSwap OBJECT-TYPE
>    SYNTAX      Integer32
>    MAX-ACCESS  read-only
>    STATUS      current
>    DESCRIPTION
>        "Minimum amount of free swap required to be free
>         or else memErrorSwap is set to 1 and an error string is
>         returned memSwapErrorMsg."
>    ::= { memory 12 }
>
>
> And that traces to net-snmp-5.2.1.2/agent/mibgroup/ucd-snmp/memory.h where
> #define MEMSWAPMINIMUM 12
>
> ...I'll look into how FreeBSD and OpenBSD accumulate this value differently. 
> It's burried in the source somewhere.
>
>
> l8*
> 	-lava
>
> x.25 - minix - bitnet - plan9 - 110 bps - ASR 33 - base8
>
>
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l8*
 	-lava

x.25 - minix - bitnet - plan9 - 110 bps - ASR 33 - base8


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September 19-22, 2005 * San Francisco, CA * Development Lifecycle Practices
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