kern/161899: Repeating RTM_MISS packets causing high CPU load for ntpd

[Li, Qing]

Hmm...  I don't see this problem until multiple FIBs are enabled.

--Qing


> -----Original Message-----
> From: owner-freebsd-net at freebsd.org [mailto:owner-freebsd-
> net at freebsd.org] On Behalf Of Steven Hartland
> Sent: Wednesday, February 08, 2012 11:13 AM
> To: Gary Palmer
> Cc: freebsd-net at freebsd.org; Gleb Smirnoff
> Subject: Re: kern/161899: Repeating RTM_MISS packets causing high CPU
> load for ntpd
> 
> ----- Original Message -----
> From: "Gary Palmer" <gpalmer at freebsd.org>
> >> Running the following commands does indeed stop this
> >> route add -inet6 ::ffff:0.0.0.0 -prefixlen 96 ::1 -reject
> >> route add -inet6 ::0.0.0.0 -prefixlen 96 ::1 -reject
> >>
> >> I found these in /etc/rc.d/network_ipv6 but I can't see why
> >> these wouldnt be run on a machine that doesn't have an IPv6
> >> address, they seem to be added correctly on machines that do.
> >
> > Speculation: the machine(s) which didn't have the routes maybe
> > didn't have
> >
> > ipv6_enable="YES"
> >
> > in /etc/rc.conf?
> 
> Doh!
> 
> Indeed they don't so of course /etc/rc.d/network_ipv6 doesnt
> start but IPv6 is in the kernel and ipv6 is configured on lo0 via
> /etc/rc.d/auto_linklocal so it looks like ipv6 is enabled even
> though it isnt.
> 
> Given this would a reasonable patch be to move the internal routing
> to auto_linklocal i.e. these lines:-
>     # disallow "internal" addresses to appear on the wire
>     route add -inet6 ::ffff:0.0.0.0 -prefixlen 96 ::1 -reject
>     route add -inet6 ::0.0.0.0 -prefixlen 96 ::1 -reject
> 
> Seems the relavent fix was part of a much bigger commit:-
> http://svnweb.freebsd.org/base?view=revision&revision=197139
> 
> So it may not be easy to patch this into 8.x
> 
>     Regards
>     Steve
> 
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