On 11/12/20 6:58 PM, Jeff Dike wrote:
> Commit 58956317c8de ("neighbor: Improve garbage collection")
> guarantees neighbour table entries a five-second lifetime. Processes
> which make heavy use of multicast can fill the neighour table with
> multicast addresses in five seconds. At that point, neighbour entries
> can't be GC-ed because they aren't five seconds old yet, the kernel
> log starts to fill up with "neighbor table overflow!" messages, and
> sends start to fail.
>
> This patch allows multicast addresses to be thrown out before they've
> lived out their five seconds. This makes room for non-multicast
> addresses and makes messages to all addresses more reliable in these
> circumstances.
>
> Fixes: 58956317c8de ("neighbor: Improve garbage collection")
> Signed-off-by: Jeff Dike <jd...@akamai.com>
> ---
> include/net/neighbour.h | 1 +
> net/core/neighbour.c | 2 ++
> net/ipv4/arp.c | 6 ++++++
> net/ipv6/ndisc.c | 7 +++++++
> 4 files changed, 16 insertions(+)
>
Reviewed-by: David Ahern <dsah...@kernel.org>
