netdev - Re: [net-next PATCH 4/4] net: frag LRU list per CPU

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Message-ID: <1366917755.8964.179.camel@edumazet-glaptop>
Date:	Thu, 25 Apr 2013 12:22:35 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jesper Dangaard Brouer <brouer@...hat.com>
Cc:	"David S. Miller" <davem@...emloft.net>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	netdev@...r.kernel.org
Subject: Re: [net-next PATCH 4/4] net: frag LRU list per CPU

On Thu, 2013-04-25 at 21:15 +0200, Jesper Dangaard Brouer wrote:

> > Q) You want performance and big number of frags to cope with attacks
> > A) resize the hash table when the admin sets a bigger limit
> 
> Q) How do we solve the per netns limit vs hash size? (Make limit
> global?)

global limit would be needed anyway.

If we want a per netns limit, that would be a second (per netns)
percpu_counter, but I feel this can be added later.

Thanks !


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