Software packet buffer depletion

[joannalow]

I am working with a client who is experiencing very high CPU utilization on the data plane and his packet buffers do not release.  He is running 8.1.7 in a lab setting with no traffic being generated to the firewall.  He has VM is setup with 6.5GB ram and 2 cores, 1 for management and 1 for data plane, and 60GB hard drive with VM-100 license.  

Show running resource monitor :

Resource utilization (%) during last 24 hours:
session (average):
  0   0   0   0   0   0   0   0   0   0   0   0   0   0   0 
  0   0   0   0   0   0   0   0   0 
session (maximum):
  0   0   0   0   0   0   0   0   0   0   0   0   0   0   0 
  0   0   0   0   0   0   0   0   0 
packet buffer (average):
  0   0   0   0   0   0   0  74 100 100 100 100 100 100 100 
100 100 100 100 100 100 100 100 100 
packet buffer (maximum):
 14  24   5  15  18  27  42 100 100 100 100 100 100 100 100 
100 100 100 100 100 100 100 100 100 
packet descriptor (average):
  0   0   0   0   0   0   0   0   0   0   0   0   0   0   0 
  0   0   0   0   0   0   0   0   0 
packet descriptor (maximum):
  0   0   0   0   0   0   0   0   0   0   0   0   0   0   0 
  0   0   0   0   0   0   0   0   0 
sw tags descriptor (average):
  0   0   0   0   0   0   0   0   0   0   0   0   0   0   0 
  0   0   0   0   0   0   0   0   0 
sw tags descriptor (maximum):
  0   0   0   0   0   0   0   0   0   0   0   0   0   0   0 
  0   0   0   0   0   0   0   0   0 

Resource monitoring sampling data (per day):

CPU load (%) during last 7 days:
core    0       1   
     avg max avg max
       *   *  99 100
       *   * 100 100
       *   * 100 100
       *   * 100 100
       *   * 100 100
       *   * 100 100
       *   * 100 100

Resource utilization (%) during last 7 days:
session (average):
  0   0   0   0   0   0   0 
session (maximum):
  0   0   0   0   0   0   0 
packet buffer (average):
 78 100 100 100 100 100 100 
packet buffer (maximum):
100 100 100 100 100 100 100 
packet descriptor (average):
  0   0   0   0   0   0   0 
packet descriptor (maximum):
  0   0   0   0   0   0   0 
sw tags descriptor (average):
  0   0   0   0   0   0   0 
sw tags descriptor (maximum):

Has any encountered this type of problem?

[joannalow]

I should also add that about 2/3rds of the current traffic on the firewall is IPv6 multicast, if that is relevant.  Thanks.