netdev - Re: nuclear neigh patch

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Message-ID: <1322774240.2750.30.camel@edumazet-laptop>
Date:	Thu, 01 Dec 2011 22:17:20 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	netdev@...r.kernel.org
Subject: Re: nuclear neigh patch

Le jeudi 01 décembre 2011 à 15:20 -0500, David Miller a écrit :
> Eric, how lucky are you feeling today? :-)
> 
> Here is a patch that gets rid of the neighbour reference for ipv4 routes.
> Neigh entries are computed at packet send time in ip_output.c
> 
> Some minor work is needed before we can flat out use something like this,
> the main issue being that there are places that assume that if we have
> a 'dst' entry then there is a non-NULL neighbour unconditionally available.
> Mainly this happens in the infiniband layer.
> 
> So we can't create a situation where dst_get_neighbour() might return NULL
> just yet.
> 
> This is worth sorting out, because then we can get rid of the neigh
> pointer entirely from dst entries.
> 
> But anyways, if this patch works it would be interesting to see what
> it does to the UDP tests on your test machine(s).

Sure, this looks great.

I'll try this tomorrow on my test machines, its 10:15pm here ;)


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