Cisco Systems 12000 series manual Separate Dram and Packet Memory, Combined Dram and Packet Memory

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Table 146 show version Field Descriptions (continued)

Field	Description
Cisco platform (processor-type)	This line can be used to determine how much Dynamic RAM
processor (revision	(DRAM) is installed on your system, in order to determine if you
processor-revision-id) with	meet the “Min. Memory” requirement for a software image. DRAM
free-DRAM-memory K/	(including SDRAM) is used for system processing memory and for
packet-memory K bytes of	packet memory.
memory.	Two values, separated by a slash, are given for DRAM: The first
Example—Separate DRAM and	value tells you how DRAM is available for system processing, and
Packet Memory:	the second value tells you how much DRAM is being used for
Cisco RSP4 (R5000) processor	Packet memory.
with 65536K/2072K bytes of	The first value, Main Processor memory, is either:
memory	• The amount of DRAM available for the processor, or
	• The total amount of DRAM installed on the system.
Example—Combined DRAM	The second value, Packet memory, is either:
and Packet Memory:
	• The total physical input/output (I/O) memory (or “Fast
Cisco 3660 (R527x) processor
	memory”) installed on the router (Cisco 4000, 4500, 4700, and
(revision 1.0) with
	7500 series), or
57344K/8192K bytes of
	• The amount of “shared memory” used for packet buffering. In
memory.
	the shared memory scheme (Cisco 2500, 2600, 3600, and 7200
	Series), a percentage of DRAM is used for packet buffering by
	the router's network interfaces.
	Note The terms “I/O memory” or “iomem”; “shared memory”;
	“Fast memory” and “PCI memory” all refer to “Packet
	Memory”. Packet memory is either separate physical RAM
	or shared DRAM.
	Separate DRAM and Packet Memory
	The 4000, 4500, 4700, and 7500 series routers have separate
	DRAM and Packet memory, so you only need to look at the first
	number to determine total DRAM. In the example to the left for the
	Cisco RSP4, the first value shows that the router has 65536K
	(65,536 kilobytes, or 64 megabytes) of DRAM. The second value,
	8192K, is the Packet memory.
	Combined DRAM and Packet Memory
	The 2500, 2600, 3600, and 7200 series routers require a minimum
	amount of I/O memory to support certain interface processors.
	The 1600, 2500, 2600, 3600, and 7200 series routers use a fraction
	of DRAM as Packet memory, so you need to add both numbers to
	find out the real amount of DRAM. In the example to the left for the
	Cisco 3660, the router has 57,344 kilobytes (KB) of free DRAM
	and 8,192 KB dedicated to Packet memory. Adding the two
	numbers together gives you 57,344K + 8,192K = 65,536K, or 64
	megabytes (MB) of DRAM.

	Cisco IOS Configuration Fundamentals Command Reference
CF-924	July 2008