High MP Memory consumption on PA-5200 Series firewall

High MP Memory consumption on PA-5200 Series firewall

27499
Created On 02/28/19 22:54 PM - Last Modified 04/08/21 22:51 PM


Symptom
When running the command show system resources from the CLI, high physical memory consumption is seen on the management plane

Example:
PA-5220> > show system resources

2019-02-28 00:49:48.058 +0100 --- top
top - 00:49:48 up 13 days, 9:01, 0 users, load average: 0.50, 0.29, 0.25
Tasks: 219 total, 1 running, 216 sleeping, 0 stopped, 2 zombie
Cpu(s): 0.2%us, 0.2%sy, 0.0%ni, 99.5%id, 0.1%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 32640996k total, 28688244k used, 3952752k free, 686940k buffers  >>>>Note that 28688244k memory is used out of 32640996k
Swap: 2007996k total, 0k used, 2007996k free, 24159980k cached

Looking into the process details, there are no processes consuming high memory.

 


Environment
  • PA-5200 Series firewall
  • PAN-OS Software version: 8.x and 9.x


Cause
Majority of the memory is cached by the Kernel.

Resolution
This is by design and expected. 

Example:
=========
2019-02-28 00:49:48.058 +0100 --- top
top - 00:49:48 up 13 days, 9:01, 0 users, load average: 0.50, 0.29, 0.25
Tasks: 219 total, 1 running, 216 sleeping, 0 stopped, 2 zombie
Cpu(s): 0.2%us, 0.2%sy, 0.0%ni, 99.5%id, 0.1%wa, 0.0%hi, 0.0%si, 0.0%st
Mem: 32640996k total, 28688244k used, 3952752k free, 686940k buffers
Swap: 2007996k total, 0k used, 2007996k free, 24159980k cached >>>>Notice the memory cached by Kernel

Similarly, at various time stamps, the same can be seen when running the show system resources command:
Mem:  32640996k total, 32368624k used,   272372k free,   286620k buffers
Swap:  2007996k total,    89740k used,  1918256k free, 26477036k cached
Mem:  32640996k total, 32444204k used,   196792k free,   287720k buffers
Swap:  2007996k total,    89740k used,  1918256k free, 26509804k cached
Mem:  32640996k total, 32419920k used,   221076k free,   288616k buffers
Swap:  2007996k total,    89736k used,  1918260k free, 26449000k cached
Mem:  32640996k total, 32426096k used,   214900k free,   290308k buffers
Swap:  2007996k total,    89736k used,  1918260k free, 26487548k cached


Additional Information
Swap memory of 3200 series firewall is 100% Utilized

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