Actually the snmp's hrStorageUsed.1 is too much smaller the
sysctl's total used memory*.
Still have not found a way to determine the total used memory
on a Freebsd system from snmp.
* { hw.physmem - ( ( vm.stats.vm.v_inactive_count +
vm.stats.vm.v_cache_count + vm.stats.vm.v_free_count ) * hw.pagesize ) }
On Tue, Aug 12, 2008 at 11:44 AM, Chee Meng Gui <[EMAIL PROTECTED]>wrote:
> Thank you Dave.
>
> Now it is becoming clearer to me.
>
> I read
> /usr/ports/net-mgmt/net-snmp/work/net-snmp-5.4.1.2/agent/mibgroup/hardware/memory
> but still don't know why the hrStorageUsed.1 is different from that
> calculated from
> sysctl.
>
> I am using the 'free' script from
>
> http://www.cyberciti.biz/faq/freebsd-command-to-get-ram-information/memory_freebsd.c
> to find out the total used memory. { hw.physmem - ( (
> vm.stats.vm.v_inactive_count + vm.stats.vm.v_cache_count +
> > vm.stats.vm.v_free_count ) * hw.pagesize ) }
>
> I can live with the slight discrepancy and use hrStorageUsed.1 as the total
> used memory.
>
> Thank you once again.
>
>
>
> On Tue, Aug 12, 2008 at 2:21 AM, Dave Shield <[EMAIL PROTECTED]>wrote:
>
>> 2008/8/12 Chee Meng Gui <[EMAIL PROTECTED]>:
>> > So the hrStorageEntry.hrStorageUsed.1 is in kilobytes?
>>
>> hrStorageUsed is reported in the units specified in hrStorageUnits.
>> So if hrStorageUnits.1 is 1024, then hrStorageUsed.1 is in Kb
>>
>>
>> > When I checked this result against the used memory output of sysctl {
>> > hw.physmem - ( ( vm.stats.vm.v_inactive_count +
>> vm.stats.vm.v_cache_count +
>> > vm.stats.vm.v_free_count ) * hw.pagesize ) } , the two were not equal.
>>
>> On FreeBSD with the latest (5.4.x) agent, "Physical memory" is
>> retrieved by running sysctl on HW_USERMEM. Most of the other
>> values are calculated by running sysctl on VM_METER
>>
>> See 'agent/mibgroup/hardware/memory/memory_freebsd.c'
>> for the details.
>>
>> Dave
>>
>
>
>
>
--
Chee Meng Gui
Function Engineering
650-833-0660
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