netdev - Re: [net-next PATCH V2 3/9] net: frag, move LRU list maintenance outside of rwlock

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Message-Id: <20121129.124839.963269461515687321.davem@davemloft.net>
Date:	Thu, 29 Nov 2012 12:48:39 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	brouer@...hat.com, fw@...len.de, netdev@...r.kernel.org,
	pablo@...filter.org, tgraf@...g.ch, amwang@...hat.com,
	kaber@...sh.net, paulmck@...ux.vnet.ibm.com,
	herbert@...dor.hengli.com.au
Subject: Re: [net-next PATCH V2 3/9] net: frag, move LRU list maintenance
 outside of rwlock

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Thu, 29 Nov 2012 09:43:24 -0800

> Use a schem with a hash table of 256 (or 1024) slots.
> 
> Each slot/bucket has : 
>   - Its own spinlock.
>   - List of items
>   - A limit of 5 (or so) elems in the list.
> 
> No more LRU, no more rehash (thanks to jhash and the random seed at boot
> or first frag created), no more reader-writer lock.
> 
> Use a percpu_counter to implement ipfrag_low_thresh/ipfrag_high_thresh

If we limit the chain sizes to 5 elements, there is no need for
any thresholds at all.
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