Date: Thu, 08 Nov 2012 02:48:25 +0400 From: "Alexander V. Chernikov" <melifaro@FreeBSD.org> To: freebsd-net@FreeBSD.org Subject: arp/ndp default hash size Message-ID: <509AE539.5050102@FreeBSD.org>
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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.
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