netdev - Re: [PATCH net-next] netem: fix classful handling

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Message-ID: <20111229103149.7256369c@nehalam.linuxnetplumber.net>
Date:	Thu, 29 Dec 2011 10:31:49 -0800
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Hagen Paul Pfeifer <hagen@...u.net>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	David Miller <davem@...emloft.net>,
	Dave Taht <dave.taht@...il.com>,
	"John A. Sullivan III" <jsullivan@...nsourcedevel.com>,
	netdev@...r.kernel.org
Subject: Re: [PATCH net-next] netem: fix classful handling

On Thu, 29 Dec 2011 19:25:03 +0100
Hagen Paul Pfeifer <hagen@...u.net> wrote:

> * Eric Dumazet | 2011-12-29 19:10:36 [+0100]:
> 
> >I dont quite understand the question. The patch I posted is supposed to
> >fix the problem. What do you want to tell to the user ?
> 
> I assumed that the patch makes it possible to replace standard tfifo?! Tfifo
> provides strict ordering, other qdisc's do not. So I thought if someone use
> netem rate|jitter with e.g. SFQ then this should be mentioned somewhere. E.g.
> "rate|jitter can only be used with tfifo qdisc". Correct me if I am wrong.
> 
> Cheers

This is actually a feature. It is documented that tfifo can be replaced
with pfifo. In other words, if default (tfifo) is used then packets
can be reordered by the delay/jitter values. But if pfifo (or other
qdisc) is used, the packets will not be reordered.
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