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 :-) - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
