[c-nsp] 7500 having problems after upgrade from 12.0.19S2 to 12.0.31S1

[Rodney Dunn]

On Tue, Nov 22, 2005 at 08:14:42AM -0500, Robert E.Seastrom wrote:
> Jon Lewis <jlewis at lewis.org> writes:
> 
> > On Tue, 22 Nov 2005, CLAEREBOUDT Elke wrote:
> >
> >> We've upgraded a 7500 from 12.0.19S2 to 12.0.31S1 , RSP has 256K of
> >> memory. After 10 days router started to misbehave and we had to isolate
> >> it from the network. Cisco case opened gave us the answer, you need 512M
> >> on a rsp when it has more then 100K routes (has 170K). Cpu is very
> >> unstable and points to snmp engine.
> >
> > What was your free mem under 12.0.19S2?  Assuming it was considerably 
> > more, I'd say there's bugs/memory leaks in the new IOS.  I've got several 
> > RSP4's with full BGP routes and 40-50mb free, all running 12.2(18)S.
> 
> ST merge was after 12.0(21)S.  The new BGP data structure is said to
> be more computationally efficient at the expense of memory efficiency.

Absolutely correct. However, there is a memory gain too in that
for a full reconvergence it takes much much less transient memory
to reconverge.

Not pointed at Robert but a general comment:

We can't code new features without making the image larger.
We do (even though some may not think so) try very very hard to
be extremely memory conscious when we code new features. The
mistake we've made is having parts where they memory can't be
upgraded and we are trying to not make that mistake again.

256M is simply not enough anymore for dual feeds and recent code.

Rodney

> 
>                                         ---Rob
> 
> 
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