From: David Miller <davem@davemloft.net>
To: hannes@stressinduktion.org
Cc: bcrl@kvack.org, william.manley@youview.com, netdev@vger.kernel.org
Subject: Re: IGMP Unsolicited Report Interval too long for IGMPv3?
Date: Thu, 25 Jul 2013 16:42:53 -0700 (PDT) [thread overview]
Message-ID: <20130725.164253.690113010547536005.davem@davemloft.net> (raw)
In-Reply-To: <20130722215108.GG6538@order.stressinduktion.org>
From: Hannes Frederic Sowa <hannes@stressinduktion.org>
Date: Mon, 22 Jul 2013 23:51:08 +0200
> On Mon, Jul 22, 2013 at 05:18:55PM -0400, Benjamin LaHaise wrote:
>> On Mon, Jul 22, 2013 at 09:43:57PM +0100, William Manley wrote:
>> > 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.
>>
>> Reducing the timeout does not solve the problem you are encountering, as
>> any packet loss will still result in a 1 second delay. I've encountered
>> similar issues dealing with LCP Echo request/replies for keepalive
>> messages on PPP sessions. The correct approach is to queue the IGMP
>> multicast join with a higher priority than other traffic in the system
>> so that the requests are not lost due to congestion of a single queue.
>> Sending packets with an 802.1p header might be appropriate in your
>> use-case, or perhaps using higher priority internal queues.
>
> Yes, we can do a little bit better. What do you think?
>
> [PATCH net-next] ipv6: send igmpv3/mld packets with TC_PRIO_CONTROL
>
> Reported-by: William Manley <william.manley@youview.com>
> Suggested-by: Benjamin LaHaise <bcrl@kvack.org>
> Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Ben, please give Hannes the feedback he is asking for.
Thanks.
next prev parent reply other threads:[~2013-07-25 23:42 UTC|newest]
Thread overview: 41+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-22 20:43 IGMP Unsolicited Report Interval too long for IGMPv3? William Manley
2013-07-22 21:09 ` 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 [this message]
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
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