cancel
Showing results for 
Search instead for 
Did you mean: 

New 3900 Install reports 95%+ Memory Utilization?

Jim_43682
Nimbostratus
Nimbostratus

Hi All, I've just set up two LTm 3900s and under the performance tab it shows that they are using 95% or memory? These are brand new, no configuration have been set on them beisdes their management IPs. Is there anythjing I can check to see why ?

 

This is what top shows.

 

PID user rr ni virt res shr s %cpu%mem time command

 

10859 root RT 0 6676m 158m 112m S 35.1 2.0 46:00.82 tmm

 

5885 root 25 5 17376 6024 2444 S 1.7 0.1 2:26.70 merged

 

5888 root 20 0 40604 30m 18m S 0.7 0.4 0:30.92 bcm56xxd

 

 

Thank you for your help!

 

11 REPLIES 11

nitass
F5 Employee
F5 Employee
what software version are you running? i think memory used in performance graph is in GB, isn't it?

 

 

to get information about memory, you can try "b memory" or "tmsh show sys memory" command.

Jim_43682
Nimbostratus
Nimbostratus

Wow tmsh show sys mem states 7.8G available and 7.2G used? OS used memory is 7.2G average 7.6G?

 

 

I'm not sure why i havent even began to configure the ltm...

 

nitass
F5 Employee
F5 Employee
i understand that is allocated memory.

 

 

sol3242: Overview of BIG-IP Traffic Management Microkernel (TMM) CPU and RAM usage

 

http://support.f5.com/kb/en-us/solutions/public/3000/200/sol3242.html

 

 

[root@B3900-R66-S14:Active:Standalone] config tmsh show sys memory | less

 

 

Sys::System Memory Information

 

------------------------------------------------------------------

 

Memory Used(bytes) Current Average Max(since 01/17/13 16:22:39)

 

------------------------------------------------------------------

 

Total Phys Memory 7.8G 7.8G 7.8G

 

OS Used Memory 7.7G 7.7G 7.7G

 

TMM Alloc Memory 5.6G 5.6G 5.6G

 

TMM Used Memory 189.9M 189.9M 189.9M

 

OS Used Swap 1.3M 1.3M 1.3M

 

Jim_43682
Nimbostratus
Nimbostratus
Sys::System Memory Information ------------------------------------------------------------------ Memory Used(bytes) Current Average Max(since 01/17/13 11:47:00) ------------------------------------------------------------------ Total Phys Memory 7.8G 7.8G 7.8G OS Used Memory 7.2G 7.5G 7.7G TMM Alloc Memory 6.2G 6.2G 6.2G TMM Used Memory 363.1M 363.1M 363.2M OS Used Swap 48.2M 16.0M 48.6M

nitass
F5 Employee
F5 Employee
i understand tmm is using 363.1M from 6.2G and host is using 1G from 2.6G (7.8G - 6.2G).

Jim_43682
Nimbostratus
Nimbostratus
I just don't know why it is reporting on the dashboard, and thru SNMP that it's memory utilization is over 95%

Jim_43682
Nimbostratus
Nimbostratus

Is this a known issue with F5 LTM v11?

 

giltjr
Nimbostratus
Nimbostratus
It's not really an issue, normal. If you look at your stats it shows 7.8 GB of physical RAM and 6.2 of that is allocated for TMM's use.

 

 

From Linux's point of view the whole 6.2 GB allocated and in use by TMM. TMM does its own memory management and shows it is really only using 363MB.

 

 

Since TMM is using 6.2GB of the 7.8, that leaves about 1.6GB for Linux and other processes that go into managing the F5 to use.

Jim_43682
Nimbostratus
Nimbostratus
I see, however our SNMP collector is reporting it at 99% used, is there a different OID I can go after as I don't want to disable the monitoring of memory completely, because I would be nice to know if and when the F5 is running hot.

 

 

Cheers!

Hi Jim, did you get any OID's? It would be better to have OID for monitoring TMM memory utilization alone rather than HOST memory?

What_Lies_Bene1
Cirrostratus
Cirrostratus

These should help;

 

-http://support.f5.com/kb/en-us/solutions/public/9000/500/sol9524.html

 

-http://thwack.solarwinds.com/docs/DOC-68549