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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

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
--
To unsubscribe from this list: send the line "unsubscribe netdev" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html