netdev - Re: [PATCH/RFC] ipv6: fib: Drop cached routes with dead neighbours on fib GC

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Message-ID: <CAL1RGDVjwddbyVdkzMeXEiqFXQNECjCWAyEFK5V5oAPddfbwZA@mail.gmail.com>
Date:	Fri, 11 Jan 2013 13:13:42 -0800
From:	Roland Dreier <roland@...nel.org>
To:	David Miller <davem@...emloft.net>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH/RFC] ipv6: fib: Drop cached routes with dead neighbours on
 fib GC

On Thu, Jan 10, 2013 at 2:18 PM, David Miller <davem@...emloft.net> wrote:
> Another reason we must make ipv6 like ipv4, which looks up neighbours
> on demand at packet output time rather than caching them in the route
> entries.

Not sure I'm qualified to perform that level of surgery, but I'll take
a look at ipv4 and try to understand how that works.

In the meantime does it make sense to put a smaller bandaid in 3.8?
I'm pretty sure this is a regression (we never saw it with older
kernels), probably due to some part of the route cache improvements
you've been doing.

 - R.
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