netdev - Re: [PATCH net-next 1/2] netem: rate-latency extension

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Message-ID: <1322201600.2872.15.camel@edumazet-laptop>
Date:	Fri, 25 Nov 2011 07:13:20 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	Hagen Paul Pfeifer <hagen@...u.net>, netdev@...r.kernel.org
Subject: Re: [PATCH net-next 1/2] netem: rate-latency extension

Le jeudi 24 novembre 2011 à 21:09 -0800, Stephen Hemminger a écrit :

> I would rather a new qdisc then add more features to the already complex
> netem.  Initially, there where was a rate control built into netem, but
> the consensus was to use stacking to do it.

Yes, but Hagen change adds a few lines to netem, and netem already
handles throttling. This is why I believe its a nice enhancement.

Being able to simulate a ratelimit  (in bits per second by the way, the
usual bandwith unit, not bytes per second...) in a very easy way seems a
good thing, even if it handles only the egress side.

As Hagen mentioned, a standard qdisc is able to rate limit, but the
first packet sent has a null delay, even if its 64Kbyte packet. It
doesnt mimic a true link.

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