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    SubjectRe: [PATCH] net: compute a more reasonable default ip6_rt_max_size
    From
    From: Arun Sharma <asharma@fb.com>
    Date: Fri, 25 May 2012 17:08:59 -0700

    > On 5/25/12 3:51 PM, David Miller wrote:
    >> From: Arun Sharma<asharma@fb.com>
    >> 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.

    Then such default routes should either be:

    1) Passed over by GC

    2) Trigger neighbour discovery when GC'd


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