Dear Sir, I have a question about memory usage. When I use command "show ver", it shows Cisco 2821 (revision 53.51) with 223232K/38912K bytes of memory. When I use command "show process memory", it shows Processor Pool Total: 112570512 Used: 38553352 Free: 74017160 I/O Pool Total: 39845888 Used: 7805776 Free: 32040112 The first one shows 256MB but the last one shows 128MB. Why this 2 command doesn't show the same value? Thanks, Pornthip
The memory displayed in the "show version" is the actual NVRAM size. Normally "startup-config" is stored in the NVRAM. The memory displayed in "show process memory" corresponds to the memory utilized for running-config, routing tables, other processes, etc.
The memory in this line of the sh ver is the physical DRAM installed.
Cisco 2821 (revision 53.51) with 223232K/38912K bytes of memory.
So in this case 256MB
On boot up, part of the memory is carved out and assigned to the I/O pool. Then IOS decompresses and initializes some data structures. Once this is done the remainder of the memory is assigned to the processor pool. When you issue a show proc mem the 'Total' is what is available after these two processes are complete.
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