Cisco Systems 12000 series manual CF-708, Router# show memory io, 600DDEC 3FCF0, Total

show memory

The output of the show memory free command contains the same types of information as the show memory output, except that only free memory is displayed, and the information is ordered by free list.

The first section of the display includes summary statistics about the activities of the system memory allocator. Table 97 describes the significant fields shown in the first section of the display.

Table 97	show memory Field Descriptions—First Section
Field		Description
Head		Hexadecimal address of the head of the memory allocation chain.
Total(b)		Sum of used bytes plus free bytes.
Used(b)		Amount of memory in use.
Free(b)		Amount of memory not in use.
Lowest(b)		Smallest amount of free memory since last boot.
Largest(b)		Size of largest available free block.

The second section of the display is a block-by-block listing of memory use. Table 98 describes the significant fields shown in the second section of the display.

Table 98	Characteristics of Each Block of Memory—Second Section
Field		Description
Address		Hexadecimal address of block.
Bytes		Size of block (in bytes).
Prev.		Address of previous block (should match the address on previous line).
Next		Address of next block (should match the address on next line).
Ref		Reference count for that memory block, indicating how many different processes are
		using that block of memory.
PrevF		Address of previous free block (if free).
NextF		Address of next free block (if free).
Alloc PC		Address of the system call that allocated the block.
What		Name of process that owns the block, or “(fragment)” if the block is a fragment, or
		“(coalesced)” if the block was coalesced from adjacent free blocks.

The show memory io command displays the free I/O memory blocks. On the Cisco 4000 router, this command quickly shows how much unused I/O memory is available.

The following is sample output from the show memory io command:

Router# show memory io

Address	Bytes	Prev.	Next	Ref	PrevF	NextF	Alloc PC	What
6132DA0	59264	6132664	6141520	0	0	600DDEC	3FCF0	*Packet Buffer*
600DDEC	500	600DA4C	600DFE0	0	6132DA0	600FE68	0
600FE68	376	600FAC8	600FFE0	0	600DDEC	6011D54	0
6011D54	652	60119B4	6011FEO	0	600FE68	6013D54	0
614FCA0	832	614F564	614FFE0	0	601FD54	6177640	0
6177640	2657056	6172E90	0	0	614FCA0	0	0

	Total: 2723244
	Cisco IOS Configuration Fundamentals Command Reference
CF-708	July 2008