netdev - Re: [PATCH] sctp: Error in calculation of RTTvar

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Date:	Wed, 28 Nov 2012 11:13:54 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	vyasevich@...il.com
Cc:	netdev@...r.kernel.org
Subject: Re: [PATCH] sctp: Error in calculation of RTTvar

From: vyasevich@...il.com
Date: Wed, 28 Nov 2012 10:18:29 -0500

> From: Schoch Christian <e0326715@...dent.tuwien.ac.at>
> 
> The calculation of RTTVAR involves the subtraction of two unsigned
> numbers which
> may causes rollover and results in very high values of RTTVAR when RTT > SRTT.
> With this patch it is possible to set RTOmin = 1 to get the minimum of RTO at
> 4 times the clock granularity.
> 
> Change Notes:
> 
> v2)
>         *Replaced abs() by abs64() and long by __s64, changed patch
> description.
> 
> Signed-off-by: Christian Schoch <e0326715@...dent.tuwien.ac.at>
> CC: Vlad Yasevich <vyasevich@...il.com>
> CC: Sridhar Samudrala <sri@...ibm.com>
> CC: Neil Horman <nhorman@...driver.com>
> CC: linux-sctp@...r.kernel.org
> Acked-by: Vlad Yasevich <vyasevich@...il.com>
> Acked-by: Neil Horman <nhorman@...driver.com>

Applied, thanks.
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