netdev - Re: IPoIB: Fix multicast packet drops before join is complete

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Date:	Mon, 8 Jun 2009 11:16:28 -0400 (EDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	Roland Dreier <rdreier@...co.com>
cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	yosefe@...taire.COM
Subject: Re: IPoIB: Fix multicast packet drops before join is complete

On Fri, 5 Jun 2009, Roland Dreier wrote:

>
>  > This is actually better than IPoIB there is nothing before
>  > the initial traffic that arrives. In the IPoIB case 3 packets arrive
>  > suggesting to the other side that the link is okay.
>
> So maybe we should drop the *oldest* packet on queue overflow?  Would
> that make things better?

Definitely. That would avoid the apps thinking that there was a huge
outage. Also the join times on some fabrics can be quite long if there is
heavy reconfiguration of the switch fabric going on. In the
order of seconds it seems. The packet is definitely stale by that time.


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