#2250 UCD-SNMP-MIB::memShared.0 no longer exist

[Anonymous]

Hello team,

it's seems the OID UCD-SNMP-MIB::memShared.0 (OID .1.3.6.1.4.1.2021.4.13.0) no more longer exist since the version 5.4.3 included.
On the same server (debian 6, kernel 2.6.38.2)
- with version 5.4.1 (from deb package OR compiled from source) I ve got an answer:
# snmpget -v2c -c pub -On server 1.3.6.1.4.1.2021.4.13.0
.1.3.6.1.4.1.2021.4.13.0 = INTEGER: 0 kB

- with version 5.4.3 (from deb package OR compiled from source) and 5.6.1 (compiled from source)
# snmpget -v2c -c pub -On server 1.3.6.1.4.1.2021.4.13.0
.1.3.6.1.4.1.2021.4.13.0 = No Such Object available on this agent at this OID

From what I understood snmpd get this value from "Shmem" in /proc/meminfo. The string is available in the file:

fkteqx-c37-15:net-snmp-5.6.1# cat /proc/meminfo
MemTotal: 24733492 kB
MemFree: 23446212 kB
Buffers: 87064 kB
Cached: 1028028 kB
SwapCached: 0 kB
Active: 496044 kB
Inactive: 635448 kB
Active(anon): 16416 kB
Inactive(anon): 144 kB
Active(file): 479628 kB
Inactive(file): 635304 kB
Unevictable: 0 kB
Mlocked: 0 kB
SwapTotal: 24150012 kB
SwapFree: 24150012 kB
Dirty: 8 kB
Writeback: 0 kB
AnonPages: 15832 kB
Mapped: 5032 kB
Shmem: 152 kB
[... SNIP ...]

Maybe I have miss a patch or feature but I'm very surprised by this disappearing

Regards
Emmanuel Vargas

[Anonymous]

Hi,
still don't know if it is a bug or a wrong use on my side?
rgds,
Emmanuel

[Robert Story]

The value for MemShared in /proc/meminfo was used and was valid for 2.4 kernels. In 2.6 kernels, it was always 0 (see http://www.tux.org/lkml/#s14-3\). Now it appears that it has been dropped completely, which is why memShared.0 is now missing.

I've googled a bit on Shmem to see if it's the same thing, but I haven't found anything authoritative.