netdev - Re: [PATCH net-next-2.6] ip: Report qdisc packet drops

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Message-ID: <alpine.DEB.1.10.0909021318490.21832@V090114053VZO-1>
Date:	Wed, 2 Sep 2009 13:22:25 -0500 (CDT)
From:	Christoph Lameter <cl@...ux-foundation.org>
To:	David Miller <davem@...emloft.net>
cc:	eric.dumazet@...il.com, sri@...ibm.com, dlstevens@...ibm.com,
	netdev@...r.kernel.org, niv@...ux.vnet.ibm.com,
	mtk.manpages@...il.com
Subject: Re: [PATCH net-next-2.6] ip: Report qdisc packet drops

On Tue, 1 Sep 2009, David Miller wrote:

> > 2) Submit a patch to account for qdisc-dropped frames in SNMP counters
> > but still return a OK to user application, to not break them ?
>
> Sounds good.

Great. That was my initial suggestion and it would ensure that no apps
break.

> If we are to make such applications "more sophisticated" such
> converted apps can be indicated simply their use of IP_RECVERR.

There may be a minor issue here in that IP_RECVERR sometimes sends error
packets that have to be intercepted using special code. Or can those be
simply ignored? If so then I will ask UDP app vendors to use IP_RECVERR.

> As usual, Alexey Kuznetsov's analysis of this situation is timeless,
> accurate, and wise.  And he understood all of this 10+ years ago.

His code was just slightly buggy .... ;-)
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