routeing table size gotcha (IPv6 ?)

["Peter Galbavy" <peter.galbavy@knowledge.com>]

I am assuming that this is the result of the IPv6 integration, but tell me
otherwise. Having innocently tried to upgrade our router kernel to
2.6-current (to support the if_dc driver for performance) I suddenly found
that the kernel was running out of memory.

Where in the past, carrying 72,000 odd routes (145,000 entries) used about
11M of routetbl entries (150 byes or so each), with the new kernel I got to
60,000 routes (120,000 routetbl entries) for 16M of space (about 260 bytes
an entry).

With the growth of addresses from 4 to 16 bytes, is this major size increase
due to (a) alignment issues, (b) prefix/netmask/etc. additions or (c) me not
knowing what is going on ?

If there is someway to optimise the FIB for full-Internet route carrying
routers, I think that this would be well received.

Regards,
--
Peter Galbavy
Knowledge Matters Ltd.
http://www.knowledge.com/
BEGIN:VCARD
VERSION:2.1
N:Galbavy;Peter
FN:Peter Galbavy
ORG:Knowledge Matters Ltd.
TITLE:Director
TEL;WORK;VOICE:+44 (0) 20 7419 4163
TEL;CELL;VOICE:+44 (0) 7710 348988
TEL;WORK;FAX:+44 (0) 20 7419 4166
ADR;WORK:;;24-25 Scala Street;London;;W1P 1LU;United Kingdom
LABEL;WORK;ENCODING=QUOTED-PRINTABLE:24-25 Scala Street=0D=0ALondon W1P 1LU=0D=0AUnited Kingdom
URL:
URL:http://www.knowledge.com/
EMAIL;PREF;INTERNET:peter.galbavy@knowledge.com
REV:20000126T145626Z
END:VCARD