netdev - Re: UDP is bypassing qdisc statistics ....

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Date:	Tue, 1 Sep 2009 06:37:26 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Mark Smith <lk-netdev@...netdev.nosense.org>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	netdev@...r.kernel.org, davem@...ux-foundation.org
Subject: Re: UDP is bypassing qdisc statistics ....

On 31-08-2009 22:58, Mark Smith wrote:
> On Mon, 31 Aug 2009 21:54:49 +0200
> Eric Dumazet <eric.dumazet@...il.com> wrote:
> 
>> Christoph Lameter a écrit :
>>> This is with 2.6.31-rc7. If I send icmp then its correctly registered as a
>>> packet by the qdisc layer:
>>>
> <snip>
>> loopback device do bypass qdisc layer for example...
> 
> On occassion, I'd have found it useful if it didn't. It'd be convenient
> to test out your qdisc config, or test out applications performance
> behaviour over a simulated WAN via netem, without having to a
> network and two hosts, and all the related miscellaneous setup work.

Probably Eric and you mean something special, but generally a loopback
and some other virtuals bypass qdisc layer only with default qdisc.

Jarek P.
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