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Song_86464's avatar
Song_86464
Icon for Nimbostratus rankNimbostratus
Sep 09, 2009

RAM Utilization really HIGH

I am not sure why but I wanted to see if someone knew why our RAM Utilization is so high.

 

 

Mem: 380668k av, 375556k used, 5112k free, 0k shrd, 27808k buff

 

217140k actv, 41424k in_d, 6444k in_c

 

Swap: 3086880k av, 27544k used, 3059336k free 154628k cached

 

 

We have a few servers and bandwidth never has been an issue actually sustains about 40% utilization. I did notice this that tmm (Tomcat I think) is working hard for some reason.

 

 

1052 root RT 0 437M 437M 436M S 98.2 117.7 3739h 0 tmm

 

 

Does anyone have any thoughts, I have a BIG IP LTM running (9.3) in a Active Standby Pair. I have about 10 Web Servers with 3 of them in a pooled configuration. I can't seem to understand why the RAM Utilization is so high, I think it's also contributing to little connection outages but not sure.

 

management
monitoring

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  • Song_86464's avatar
    Song_86464
    Icon for Nimbostratus rankNimbostratus
    Sep 09, 2009
    I also had to disable Reaper High-water Mark and Reaper Low-water Mark by setting it to 100% since it was timing out on connections. Not sure if this was a good thing since it prevents DOS Attacks but still don't understand why the RAM Utilization is so high.
  • JRahm's avatar
    JRahm
    Icon for Admin rankAdmin
    Sep 10, 2009
    I'd open a case on this issue, you might have a memory leak.
  • JRahm's avatar
    JRahm
    Icon for Admin rankAdmin
    Sep 10, 2009
    it looks like your numbers are from the linux side of things, which are not reliable. Still if you are having timeouts, I'd get a case open.
  • hooleylist's avatar
    hooleylist
    Icon for Cirrostratus rankCirrostratus
    Sep 10, 2009
    TMM is the Traffic Management Microkernel. It's the main load balancing daemon. For pre-9.4.2 top will not report accurate metrics for TMM's resource utilisation. You can check SOL3242 for details:

     

     

    SOL3242: Traffic Management Microkernel (TMM) CPU and RAM usage

     

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

     

     

    It would still be a good idea to open a case with F5 about this.

     

     

    Aaron