netdev - Re: Premature timeout for MLDv1 Host compatibility mode?

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Message-ID: <OFB6FB6105.8DE1252A-ON85257A4E.004637D4-85257A4E.00474EEF@us.ibm.com>
Date:	Thu, 2 Aug 2012 08:58:54 -0400
From:	David Stevens <dlstevens@...ibm.com>
To:	Dragos Ilie <dragos.ilie@...il.com>
Cc:	netdev@...r.kernel.org, netdev-owner@...r.kernel.org
Subject: Re: Premature timeout for MLDv1 Host compatibility mode?

netdev-owner@...r.kernel.org wrote on 07/26/2012 10:57:43 AM:

> RFC 3810 says that the timeout should be computed as
> Robustness_Variable * Query_Interval + Query_Response_Interval. This
> suggests that the line where switchback is computed should be changed
> to something like
> 
> switchback = (idev->mc_qrv * 125 * HZ)  + max_delay;
> 
> where 125 is the default Query_Interval in seconds

Dragos,
        I agree that it's too short, but this shouldn't be using the
default value, but rather the actual value of the querier, if one is 
present,
as calculated from a QQIC in a query. I suggest saving the QQI,
decoded, in a new "idev->mc_qqi" which should be initialized to 125
but updated by received queries and then using:

switchback = idev->mc_qrv * idev->mc_qqi * HZ + max_delay;

                                                +-DLS

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