Re: [PATCH net/for-next V1 1/1] IB/ipoib: break linkage to neighbouring system

From: Or Gerlitz <ogerlitz-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Date: Thu, 19 Jul 2012 19:20:41 +0300

On 7/19/2012 6:24 PM, Christoph Lameter wrote:

quoted

On Thu, 19 Jul 2012, Shlomo Pongartz wrote:

quoted

The garbage collection and stale times follow the default ipv4/6
neigh.default.gc_yyy
sysctl values, for example

net.ipv4.neigh.default.gc_interval = 30
net.ipv4.neigh.default.gc_stale_time = 60

If given access to these values from IPoIB, we will be happy
to integrate them into that logic

It looks like the values are hardcoded right now.

Two points here,

1s, they are indeed hard-coded since there's no define/enum
that holds their default values (or maybe we should add one now?), see
this code snippest from net/ipv4/arp.c

These numbers come from the IPV6 Neighbour Discovery RFCs.  IPV4
replicates the Neighbour Unreachability Detection schemes of IPV6 in
pretty much it's entirety, and therefore takes on the same timeout et
al. parameters.
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