Re: [PATCH] net: compute a more reasonable default ip6_rt_max_size

[Arun Sharma]

On 5/25/12 3:51 PM, David Miller wrote:
> From: Arun Sharma<asharma@xxxxxx>
> Date: Fri, 25 May 2012 15:22:54 -0700
>
> > On 5/25/12 1:47 PM, Eric Dumazet wrote:
> > > On Fri, 2012-05-25 at 13:15 -0700, Arun Sharma wrote:
> > > > The algorithm is based on ipv4 and alloc_large_system_hash().
> > >
> > > Why is it needed at all ?
> > >
> > > IPv4 has a route cache with potentially millions of entries, not IPv6.
> >
> > With the default size of 4096 for the ipv6 routing table, entries can
> > get garbage collected and hosts could lose their default route and
> > therefore lose connectivity.
> >
> > We actually saw it happen.
>
> Under no circumstances should administrator configured ipv6 routes be
> garbage collected, that is a bug.

These were not admin configured routes. They were discovered via ipv6 
neighbor discovery.

 -Arun
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