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

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Message-ID: <20111229174323.GC2948@hell>
Date:	Thu, 29 Dec 2011 18:43:24 +0100
From:	Hagen Paul Pfeifer <hagen@...u.net>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Stephen Hemminger <shemminger@...tta.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

* Eric Dumazet | 2011-12-29 18:15:50 [+0100]:

>> In other words netem jitter and a qdisc !tfifo will not work. Correct? The
>> rate extension also peak the last packet to get the reference time (assuming a
>> strict ordering):
>> 
>
>Yep, current situation is borked. It assumes we _use_ tfifo, for delay
>jitters but also for rate extension.

Mhh, should we signal this to the user via 'tc -s qdisc show'? Or should we
assume that a user who set netem rate|jitter AND a qdisc !tfifo knows what he
does - because we assume he is a experienced user? At least somewhere in the
manpage a comment should point to this characteristic.
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