I you have more then the minimum amount of memory, then you probably
wnat the minimum I/O memory reservation. Where you'd want more
would be "complex" interfaces like channelized t1/t3 or ATM, just
a few t1's aren't going to be an issue.
On 7200's only the NSE-1 / NPE-175-225 / NPE-400 have unified
buffer and processor memory vs. separate SRAM/DRAM or multi-DIMM
applications. Currrently there is no known handle for setting
the fence on those boxes, but it seems that it's either a
precentage or IOS version dependent, i.e. I have two NSE-1 based
routers and the IOMEM size is different. 8-)
George
> From cisco-nsp-request@puck.nether.net Fri Jun 1 14:24:55 2001
> Date: Fri, 1 Jun 2001 11:11:40 -0400
> X-From_: marius@marius.org Fri Jun 1 11:11:40 2001
> Received-Date: Fri, 1 Jun 2001 11:11:40 -0400
> Old-Date: Fri, 1 Jun 2001 10:11:34 -0500
> From: Marius Strom <marius@marius.org>
> To: "Mark E. Mallett" <mem@mv.mv.com>
> Cc: cisco-nsp@puck.nether.net
> Subject: Re: Full BGP and memory
> Mail-Followup-To: "Mark E. Mallett" <mem@mv.mv.com>,
> cisco-nsp@puck.nether.net
> References: <20010531183017.D743@greenie.muc.de> <200106010411.AAA25624@iridium.mv.net>
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> In-Reply-To: <200106010411.AAA25624@iridium.mv.net>; from mem@mv.mv.com on Fri, Jun 01, 2001 at 12:11:45AM -0400
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>
> Is there a "guideline" baseline for I/O mem usage? I'm noticing we're
> not using over 2.5M right now for I/O, but there is 33.5M allocated.
> We're not running BGP (yet, but will be early next week) and I'm curious
> of the I/O usage will increase with the BGP or if it is strictly a
> measure of interface utilization?
>
> It's a 3640, with two quad serial interfaces (5 of which are in use) and
> 2 FE ports (1 of which is in use). Any info on I/O guidelines would be
> /greatly/ appreciated (else I'll just watch and tweak)
>
> On Fri, Jun 01, 2001 at 12:11:45AM -0400, Mark E. Mallett wrote:
> > On some routers (e.g. the 36xx) you can relieve the memory crunch
> > somewhat by allocating less than the default slice to I/O memory
> > via "memory-size iomem nn". At least in our case, we don't need
> > one quarter of the 128MB available allocated to iomem . I don't
> > see an equivalent for the 7200 series: is there one?
> >
> > -mm-
> >
>
> --
> Marius Strom <marius@marius.org>
> Professional Geek/Unix System Administrator
> URL: http://www.marius.org/
> http://www.marius.org/marius.pgp 0xF5D89089 *updated 2001-02-26*
>
> It is a natural law. Physics tells us that for every action, there must be an
> equal and opposite reaction. They hate us, we hate them, they hate us back and
> so, here we are, victims of mathematics.
> -- Londo, "A Voice in the Wilderness I"
>
>
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