netdev - Re: rib_trie / Fix inflate_threshold

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Message-ID: <20090628120328.GA2739@ami.dom.local>
Date:	Sun, 28 Jun 2009 14:03:28 +0200
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Robert Olsson <robert@...ur.slu.se>
Cc:	Robert Olsson <Robert.Olsson@...a.slu.se>,
	=?ISO-8859-2?Q?Pawe=B3_Staszewski?= 
	<pstaszewski@...are.pl>, "Jorge Boncompte [DTI2]" <jorge@...2.net>,
	Eric Dumazet <dada1@...mosbay.com>,
	Robert Olsson <robert.olsson@....uu.se>,
	Linux Network Development list <netdev@...r.kernel.org>
Subject: Re: rib_trie / Fix inflate_threshold_root. Now=15 size=11 bits

On Sun, Jun 28, 2009 at 01:04:51PM +0200, Robert Olsson wrote:
...
>  Yes we keep the old tnode size and the convergence interval was some
>  of the concerns. That why this checks was added. Still we want to
>  inflate the root node to a very max. 
> 
>  So this approach with halving or doubling tnodes towards the root
>  node was the suggest by Dyntree paper. I asked Stefan (one of the
>  authors) if we could get safe and very offensive settings. But 
>  from what I understood there was no easy way to calculate this. 
>  So any bright ideas in this area are very welcome. But we should
>  also monitor size of root and average tree depth so we don't
>  take an to defensive approach just to solve this case.

Yes, but with this offensive approach it seems the current level of
warnings could be too alarming. Btw., because of a design flaw in my
current patch this _fix variable, which should be logically per trie/
table, can be reset by changes of other tables now, but I think it
all could be fine tuned more in the future. Of course if there are
people interested in testing/reporting this more.

Thanks,
Jarek P.
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