[c-nsp] Enabling IPv6 on 2951 with VRF consumed 240MB of RAM. Why?

[Jay Nakamura]

We have a 2951 router where there are couple VRF and one of the VRF is
running BGP taking quite a bit of IPv4 routes.  The router is running
15.0(1)M with 1GB RAM.

This is the memory usage before.


                Head    Total(b)     Used(b)     Free(b)   Lowest(b)  Largest(b)
Processor   117804CC   793246516   452414252   340832264   338971080   333277968
      I/O   3DC00000    37748736    18709680    19039056    18986112    19000860

I am in the process of implementing IPv6 so I enabled IPv6 on the
router on that one VRF and BGP.  Now just enabling it consumed 260MB
of RAM


                Head    Total(b)     Used(b)     Free(b)   Lowest(b)  Largest(b)
Processor   117804CC   793246516   716103208    77143308    76800456    76068796

This is without taking any routes or putting any IPv6 IP on the interfaces.

Is this normal?  Is it pre-allocating something?  Is there a way to
some how reduce the usage?  We are in the process of adding memory but
I will feel more comfortable knowing what ate up that much memory.

Thanks,