From owner-freebsd-net@FreeBSD.ORG  Tue Jan 10 22:27:03 2012
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Date: Tue, 10 Jan 2012 14:26:45 -0800
From: Doug Barton <dougb@FreeBSD.org>
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To: Dennis Koegel <dk@neveragain.de>
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Cc: freebsd-net@freebsd.org, hrs@FreeBSD.org
Subject: Re: Unnecessary sleep in network.subr: ipv6_up()
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Looping in the author of that change ...

On 01/10/2012 02:24, Dennis Koegel wrote:
> Cheers,
> 
> problem: Having a *lot* of IPv6 interfaces (Vlan interfaces in this case)
> causes a huge and annoying delay time at system boot in 9.0R.
> 
> ipv6_up() in network.subr does this:
> 
> +	# wait for DAD
> +	sleep `${SYSCTL_N} net.inet6.ip6.dad_count`
> +	sleep 1
> 
> This happens for each and every interface, at a minimum (and default) of
> two seconds per interface.
> 
> It seems the behaviour was introduced with r197139. Before this merge,
> /etc/rc.d/network_ipv6 did the same sleeps, but only once for the whole
> network startup.
> 
> I don't see why this should happen per interface, so I suggest the extra
> sleeps are limited to "once per network startup" once again (or maybe
> removed?).


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