From: Martin Josefsson <gandalf@wlug.westbo.se>
Date: 22 May 2003 15:03:07 +0200
On Thu, 2003-05-22 at 13:44, Simon Kirby wrote:
> Nice! I tested with 300,000 routing table entries and there is no
> discernable difference in performance from having an empty table.
> vmstat shows the same idle time as when the routing table is empty.
How much memory does a table that large use?
300,000 * sizeof(struct fib_node)
the second term is:
(2 * sizeof_pointer_on_this_architecture) + /* 8 or 16 bytes */
sizeof(u32) + /* 4 bytes */
4 * sizeof(u8)) /* 4 bytes */
So that's 16 bytes on 32-bit systems, and 24 bytes on 64-bit systems.
Therefore 300,000 routes take up 4.8MB on 32-bit systems and 7.2MB
on 64-bit ones.
I cannot fathom a way to make these any smaller :-)
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