From: Roland Dreier <rdreier@cisco.com>
To: Christoph Lameter <cl@linux-foundation.org>
Cc: David Miller <davem@davemloft.net>,
netdev@vger.kernel.org, yosefe@Voltaire.COM
Subject: Re: IPoIB: Fix multicast packet drops before join is complete
Date: Fri, 05 Jun 2009 09:56:00 -0700 [thread overview]
Message-ID: <adaeitywrfj.fsf@cisco.com> (raw)
In-Reply-To: <alpine.DEB.1.10.0906050959380.23895@gentwo.org> (Christoph Lameter's message of "Fri, 5 Jun 2009 10:18:15 -0400 (EDT)")
> ARP is tied to managing small chunks of information about the network
> infrastructure. Buffering the first few and throwing the rest away is
> appropriate there for what the ARP protocol intends to do.
Yes, but what the IP stack is doing is queueing a few packets while ARP
is pending and dropping all other packets until the destination ethernet
address is resolved.
> UDP multicasting can be used for streaming information. And right now the
> IPoIB layer is dropping thousands of packets whenever there was a pause of
> a few minutes or when a new multicast group is used and there is some
> delay that the network need to reestablish the multicast route.
Yes -- and the required IB multicast resolution seems like it is an L2
thing precisely analogous to ARP. So I think the original IPoIB code
actually was doing the right thing.
- R.
next prev parent reply other threads:[~2009-06-05 16:55 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-06-02 14:49 IPoIB: Fix multicast packet drops before join is complete Christoph Lameter
2009-06-04 5:41 ` David Miller
2009-06-04 14:28 ` Or Gerlitz
2009-06-04 15:52 ` Christoph Lameter
2009-06-04 22:30 ` David Miller
2009-06-05 14:18 ` Christoph Lameter
2009-06-05 16:56 ` Roland Dreier [this message]
2009-06-05 19:17 ` Christoph Lameter
2009-06-05 21:12 ` Roland Dreier
2009-06-06 1:17 ` David Miller
2009-06-05 21:13 ` Roland Dreier
2009-06-08 15:16 ` Christoph Lameter
2009-06-06 1:16 ` David Miller
2009-06-08 15:20 ` Christoph Lameter
2009-06-08 21:29 ` David Miller
2009-06-09 20:52 ` Roland Dreier
2009-06-10 0:45 ` David Miller
2009-06-10 3:55 ` Roland Dreier
2009-06-10 4:57 ` David Miller
2009-06-10 5:04 ` Roland Dreier
2009-06-10 5:12 ` David Miller
2009-06-10 10:18 ` Or Gerlitz
2009-06-10 12:01 ` David Miller
2009-06-11 11:45 ` Or Gerlitz
2009-06-11 11:57 ` David Miller
2009-06-11 15:07 ` Christoph Lameter
2009-06-11 23:58 ` David Miller
2009-06-12 14:17 ` Christoph Lameter
2009-06-05 16:54 ` Roland Dreier
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