Fast memory on the 'show mem' display is not the same as Packet memory on
the RSP (MEMD)
The fast memory (128K) is carved out of main memory and is used to store
IDB data structures, It is no big deal if we run out of fast memory,
processor memory would be used.
Hope that clears the consusion.
Vijay
On Fri, 10 Sep 1999, Ron Buchalski wrote:
> >From: Deepak Jain <deepak@ai.net>
> >To: cisco-nsp@puck.nether.net
> >Subject: [nsp] Fast Mem on an RSP4
> >Date: Thu, 9 Sep 1999 12:33:57 -0400 (EDT)
> >
> >
> > Head Total(b) Used(b) Free(b) Lowest(b) Largest(b)
> >Processor 60AD9EE0 122839328 116858180 5981148 4160012
> >268352
> > Fast 60AB9EE0 131072 125944 5128 5128 5084
> >
> >--
> >
> >Of 128KB of memory, this router has 5K free. I am assuming it is used
> >for packet buffers or something dynamically allocated, but I would guess
> >that it is running pretty close to the edge with these numbers.
> >
> >Is there a rule of thumb here and can the SRAM on an RSP4 be upgraded?
> >
>
> SRAM on the RSP4 is not upgradeable. The SRAM on the VIP2-50 can be
> upgraded to either 4MB or 8MB (default is 2MB). The SRAM on the VIP2-40 is
> fixed at 2MB (for the rest of the world, Peter ;-)).
>
> It's better to distribute packet memory across the router since you can
> distribute switching across the box (distributed optimum, dCEF, etc). Of
> course, even though switching is distributed, all packets switched between
> VIPs must go through SRAM on the RSP4, although the RSP4 doesn't need to
> process them. If the RSP4's SRAM is momentarily full, the packets just
> remain on the VIP's SRAM a bit longer. So, increasing VIP SRAM (when
> possible) is the way to go.
>
> Packets switched between ports on the same VIP remain on the card are not
> seen by the RSP4.
>
> -rb
>
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