netdev - Re: Extensible hashing and RCU

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Date:	Thu, 22 Feb 2007 00:13:53 +0100
From:	Robert Olsson <Robert.Olsson@...a.slu.se>
To:	David Miller <davem@...emloft.net>
Cc:	dada1@...mosbay.com, andi@...stfloor.org, johnpol@....mipt.ru,
	akepner@....com, linux@...izon.com, netdev@...r.kernel.org,
	bcrl@...ck.org
Subject: Re: Extensible hashing and RCU


David Miller writes:

 > But what about if tree lookup were free :-)
 > 
 > This is why I consider Robert Olsson's trash work the most promising,
 > if we stick sockets into his full flow identified routing cache trie
 > entries, we can eliminate lookup altogether.
 > 
 > Just like how he already uses traffic inspection to kill cache entries
 > when FIN shutdown sequence is snooped, we can explicitly flush such
 > entries when socket is closed fully on local system.

 Below is current tree-stats from a "production" flowlogging application at a 
 large university (real traffic) using this full flow lookup.

 With 100k flows we typically see an aver depth 1.3 and a max depth 4. Right 
 now there is only a dst entry in leaf nodes. So yes anything else we can put 
 in leaf is "free".

trie:
        Aver depth:     1.31
        Max depth:      4
        Leaves:         99930
        Internal nodes: 14925
          1: 13450  2: 1465  3: 9  18: 1
        Pointers: 294976
Null ptrs: 180122
Total size: 7259  kB

Cheers.
						--ro
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