netdev - Re: [PATCH net-2.6] Re: rib_trie / Fix inflate_threshold

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Date:	Thu, 2 Jul 2009 17:31:58 +0200
From:	Robert Olsson <robert@...julf.net>
To:	Jarek Poplawski <jarkao2@...il.com>
Cc:	Paweł Staszewski <pstaszewski@...are.pl>,
	Linux Network Development list <netdev@...r.kernel.org>,
	Robert Olsson <Robert.Olsson@...a.slu.se>
Subject: Re: [PATCH net-2.6] Re: rib_trie / Fix inflate_threshold_root.
	Now=15 size=11 bits

Jarek Poplawski writes:

 > Yes, it looks like we can't free memory so simple because of such huge
 > latencies.  

 Controlling RCU seems crucial. Insertion of the full BGP table increased
 from 2 seconds to > 20 min with one synchronize_rcu patches.

 And fib_trie "worst case" wrt memory is the root node. So maybe we should 
 monitor changes in root node and use this to control synchronize_rcu.

 Didn't Paul suggest something like this?

 And with don't find any decent solution we have to add an option for 
 a fixed and pre-allocated root-nod typically for BGP-routers.

 Cheers
					--ro
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