netdev - Re: [PATCH] net: implement emergency route cache rebulds when gc

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Message-ID: <20081002071631.GB20406@2ka.mipt.ru>
Date:	Thu, 2 Oct 2008 11:16:31 +0400
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	Neil Horman <nhorman@...driver.com>
Cc:	Eric Dumazet <dada1@...mosbay.com>,
	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	kuznet@....inr.ac.ru, pekkas@...core.fi, jmorris@...ei.org,
	yoshfuji@...ux-ipv6.org, kaber@...sh.net
Subject: Re: [PATCH] net: implement emergency route cache rebulds when gc_elasticity is exceeded

Hi.

On Tue, Sep 30, 2008 at 02:42:49PM -0400, Neil Horman (nhorman@...driver.com) wrote:
> I think what you're looking for here is a simple standard deviation, isn't it?
> Compute the mean chain legnth, sum the squares of the deviations of each chain
> and take the square root.  Any individual chain longer than the mean chain
> length + 1 standard deviation can be considered an 'outlier' and therefore
> trigger a rebuild of the table for that net namespace.
> 
> I full well realize that thats easier said than done, but does that seem about
> right?  If so, I can start working on trying to build something to accomplish
> that.

You are right, but in kernel it may not that simple to get a square
root... We can probably play with logarithms though.

-- 
	Evgeniy Polyakov
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