I recently upgraded several 3640s from 64MB to 128MB of DRAM. I am experiencing conflicting memory size information from the IOS. "Sho Ver" correctly shows the amount of memory I physically installed on the router:
Processor board ID 26855150
R4700 CPU at 100MHz, Implementation 33, Rev 1.0
1 FastEthernet interface
3 Serial interfaces
DRAM configuration is 64 bits wide with parity disabled.
125K bytes of NVRAM.
32768K bytes of processor board System flash (Read/Write)
Sho mem with IOS version 12.4(5b) shows apx 20mb of DRAM:
TEST#sho mem sum
Head Total(b) Used(b) Free(b) Lowest(b) Largest(b)
From your logs , both seems to be the same , I think you have pasted the same .
As we know that cisco releases IOS with variuos versions and it includes some new features also . So the older ios might have taken a less memory , but the new ios would have got some new features and will take more memory . So you will always see a difference after the IOS upgrade.
You indeed have far less memory available than what is installed. I have verified my theory with our 1760 router running CME.
The sum of Total Processor + Total IO equals about 80MB.
In my opion he rest is taken by the program code which is also loaded into RAM. On flash this takes 29MB which could very well be nearly 50MB after decompression. This adds up quite nicely to the 128MB that is actually installed.
I assume that this will also be more or less correct for your system. Are you perhaps running enterprise code?
I am running enterprise code. So "show memory stat" shows memory utilization after system overhead, such as the uncompressed IOS, is excluded? I did a "show region" as suggested above. If I add up IOMEM and Main, I reach a 128MB total, which is correct.
Does anyone know how NMSs obtain info to perform memory utilization calculations? Thanks for all of your help.
Hi everyone, I would like to thank you in advance for any help you can provide a newcomer like myself!
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