netdev - Re: [PATCH stable 3.4 1/2] ipv4: move route garbage collector to work queue

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Date:	Tue, 12 Aug 2014 13:23:23 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Hannes Frederic Sowa <hannes@...hat.com>
Cc:	Marcelo Ricardo Leitner <mleitner@...hat.com>, davem@...emloft.net,
	netdev@...r.kernel.org
Subject: Re: [PATCH stable 3.4 1/2] ipv4: move route garbage collector to
 work queue

On Tue, 2014-08-12 at 20:50 +0200, Hannes Frederic Sowa wrote:
> On Mo, 2014-08-11 at 19:41 -0300, Marcelo Ricardo Leitner wrote:
> > Currently the route garbage collector gets called by dst_alloc() if it
> > have more entries than the threshold. But it's an expensive call, that
> > don't really need to be done by then.
> > 
> > Another issue with current way is that it allows running the garbage
> > collector with the same start parameters on multiple CPUs at once, which
> > is not optimal. A system may even soft lockup if the cache is big enough
> > as the garbage collectors will be fighting over the hash lock entries.
> > 
> > This patch thus moves the garbage collector to run asynchronously on a
> > work queue, much similar to how rt_expire_check runs.
> > 
> > There is one condition left that allows multiple executions, which is
> > handled by the next patch.
> > 
> > Signed-off-by: Marcelo Ricardo Leitner <mleitner@...hat.com>
> > Cc: Hannes Frederic Sowa <hannes@...hat.com>
> 
> Acked-by: Hannes Frederic Sowa <hannes@...essinduktion.org>


This does not look as stable material.

One can always disable route cache in 3.4 kernels



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