Why is the value of SHMALL parameter differing with ipcs command output?

Issue

• The parameter SHMALL was set to be 16777216 in /proc/sys/kernel/shmall. However, with the command "ipcs -l", following is the output:

  [root@test kernel]# ipcs -l
  
  ------ Shared Memory Limits --------
  max number of segments = 8192
  max seg size (kbytes) = 33554432
  max total shared memory (kbytes) = 67108864
  min seg size (bytes) = 1
  
  ------ Semaphore Limits --------
  max number of arrays = 8192
  max semaphores per array = 250
  max semaphores system wide = 256000
  max ops per semop call = 32
  semaphore max value = 32767
  
  ------ Messages: Limits --------
  max queues system wide = 31744
  max size of message (bytes) = 65536
  default max size of queue (bytes) = 65536
  

• Need to know why does these values differ.