netdev - Re: [PATCH] net: fix length computation in rt_check

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Message-Id: <20090519.231313.155860479.davem@davemloft.net>
Date:	Tue, 19 May 2009 23:13:13 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	dada1@...mosbay.com
Cc:	nhorman@...driver.com, jarkao2@...il.com, lav@....ru,
	shemminger@...ux-foundation.org, netdev@...r.kernel.org
Subject: Re: [PATCH] net: fix length computation in rt_check_expire()

From: Eric Dumazet <dada1@...mosbay.com>
Date: Wed, 20 May 2009 06:54:22 +0200

> I would like to split patches because we have two bugs indeed, and
> I prefer to get attention for both problems, I dont remember Neil acknowledged
> the length computation problem.
> 
> First and small patch, candidate for net-2.6 and stable (for 2.6.29) :
> 
> Thank you
> 
> [PATCH] net: fix length computation in rt_check_expire()
> 
> rt_check_expire() computes average and standard deviation of chain lengths,
> but not correclty reset length to 0 at beginning of each chain.
> This probably gives overflows for sum2 (and sum) on loaded machines instead 
> of meaningful results.
> 
> Signed-off-by: Eric Dumazet <dada1@...mosbay.com>

Yes I definitely agree this length initialization is a bug.

I'll integrate this fix soon, thanks Eric.  You can send me the
other part of the bug fix relative to this if you like.
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