On 07.11.2012 23:48, Alexander V. Chernikov wrote:
Hello list!Currently size of arp/ndp hash is the following: #define LLTBL_HASHTBL_SIZE 32 /* default 32 ? */ This may be OK for end hosts, but this is definitely not enough for router howadays. Especially given that IPv6 hosts generate 2 ndp records. Output from 2 random v4 / v6 routers from my $job: 2:23 [0] m@matisse arp -an | wc -l 1494 2:24 [0] m@singapore ndp -an | wc -l 3999 Given that LIST_HEAD is just a pointer, and we currently have single global (actually per-VNET) instance for every l3 proto, bumping hash to, say, at least 4096 should do no harm.
A small list per hash bucket isn't bad. The hash should be about 1/4 of the expected table size. One problem here may be the memory consumption on smaller systems. A very large hash table size may hurt and isn't needed for a few entries. For a compromise I'd say the default hash table size should be 256 or 512. -- Andre _______________________________________________ freebsd-net@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-net To unsubscribe, send any mail to "freebsd-net-unsubscr...@freebsd.org"
