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From: William Manley <william.manley@youview.com>
To: <netdev@vger.kernel.org>
Subject: IGMP Unsolicited Report Interval too long for IGMPv3?
Date: Mon, 22 Jul 2013 21:43:57 +0100	[thread overview]
Message-ID: <51ED998D.7000300@youview.com> (raw)

If an IGMP join packet is lost you will not receive data sent to the 
multicast group so if no data arrives from that multicast group in a 
period of time after the IGMP join a second IGMP join will be sent.  The 
delay between joins is the "IGMP Unsolicited Report Interval".

In the kernel this seems to be hard coded to be chosen randomly between 
0-10s.  In our use-case (IPTV) this is too long as it can cause channel 
change to be slow in the presence of packet loss.

I would guess that this 10s has come from IGMPv2 RFC2236, which was 
reduced to 1s in IGMPv3 RFC3376.

There was a thread about this on linux-rdma in 2010 in the context of IP 
over Infiniband but it seems no patches got applied as a result of the 
discussion:

http://www.mail-archive.com/linux-rdma@vger.kernel.org/msg05740.html

Would the right patch reducing the unsolicited report interval for 
IGMPv3 be acceptable now?

Thanks

Will

             reply	other threads:[~2013-07-22 20:44 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2013-07-22 20:43 William Manley [this message]
2013-07-22 21:09 ` IGMP Unsolicited Report Interval too long for IGMPv3? Ben Hutchings
2013-07-24 13:38   ` [PATCH] net: igmp: Reduce Unsolicited report interval to 1s when using IGMPv3 William Manley
2013-07-24 13:45     ` William Manley
2013-07-24 14:51     ` Sergei Shtylyov
2013-07-25 12:14   ` [PATCH 1/2] " William Manley
2013-07-25 12:14     ` [PATCH 2/2] net: igmp: Allow user-space configuration of igmp unsolicited report interval William Manley
2013-07-26 16:36       ` Hannes Frederic Sowa
2013-07-29 14:21         ` [PATCH v3 1/2] net: igmp: Reduce Unsolicited report interval to 1s when using IGMPv3 William Manley
2013-07-29 14:21           ` [PATCH v3 2/2] net: igmp: Allow user-space configuration of igmp unsolicited report interval William Manley
2013-07-30  6:14             ` Hannes Frederic Sowa
2013-07-30 23:55               ` David Miller
2013-07-31  6:34                 ` Hannes Frederic Sowa
2013-07-31  9:47                   ` William Manley
2013-08-06 18:03                   ` IGMP Unsolicited report interval patches William Manley
2013-08-06 18:03                     ` [PATCH v4 1/3] net: igmp: Reduce Unsolicited report interval to 1s when using IGMPv3 William Manley
2013-08-07  0:45                       ` Hannes Frederic Sowa
2013-08-07 13:43                       ` Benjamin LaHaise
2013-08-06 18:03                     ` [PATCH v4 2/3] net: igmp: Don't flush routing cache when force_igmp_version is modified William Manley
2013-08-07  0:45                       ` Hannes Frederic Sowa
2013-08-07 13:43                       ` Benjamin LaHaise
2013-08-06 18:03                     ` [PATCH v4 3/3] net: igmp: Allow user-space configuration of igmp unsolicited report interval William Manley
2013-08-07  1:00                       ` Hannes Frederic Sowa
2013-08-07 13:43                       ` Benjamin LaHaise
2013-08-07  1:03                     ` IGMP Unsolicited report interval patches Hannes Frederic Sowa
2013-08-08  9:01                       ` Hannes Frederic Sowa
2013-08-09 18:28                     ` David Miller
2013-07-31  5:07             ` [PATCH v3 2/2] net: igmp: Allow user-space configuration of igmp unsolicited report interval Bill Fink
2013-07-29 21:34           ` [PATCH v3 1/2] net: igmp: Reduce Unsolicited report interval to 1s when using IGMPv3 Hannes Frederic Sowa
2013-07-26 16:32     ` [PATCH " Hannes Frederic Sowa
2013-07-26 16:39       ` Hannes Frederic Sowa
2013-07-29 14:39         ` William Manley
2013-07-29 14:56           ` Hannes Frederic Sowa
2013-07-22 21:18 ` IGMP Unsolicited Report Interval too long for IGMPv3? Benjamin LaHaise
2013-07-22 21:51   ` Hannes Frederic Sowa
2013-07-25 23:42     ` David Miller
2013-07-26 13:11       ` Benjamin LaHaise
2013-07-26 15:06         ` Hannes Frederic Sowa
2013-07-26 15:15           ` Benjamin LaHaise
2013-07-22 22:06   ` Lukas Tribus
2013-07-22 22:30     ` Hannes Frederic Sowa
  -- strict thread matches above, loose matches on Subject: below --
2013-07-22 10:50 William Manley
2013-07-22 20:17 ` David Miller

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