netdev - Re: [PATCH] netem: fix rate extension and drop accounting

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Message-ID: <20120704173000.GC3455@nuttenaction>
Date:	Wed, 4 Jul 2012 19:30:00 +0200
From:	Hagen Paul Pfeifer <hagen@...u.net>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	netdev <netdev@...r.kernel.org>, Yuchung Cheng <ycheng@...gle.com>,
	Andreas Terzis <aterzis@...gle.com>,
	Mark Gordon <msg@...gle.com>
Subject: Re: [PATCH] netem: fix rate extension and drop accounting

* Eric Dumazet | 2012-07-04 19:23:21 [+0200]:

>I fear you did your tests with no delay on netem.
>
>Try to setup a rate of 100kbit and a delay of 100ms and to really get
>full bandwith (100kbit), I am afraid it doesnt work.
>
>Your algo is OK only if no packets are in queue (obviously)
>
>But if you have 2 or 3 packets, the delay are cumulative,
>but the delay should be a fixed bias for each packet.

Right, we did not test it with delay because we emulated satelite links.
Static delay was negligible. All delay was caused by a limited rate. ok, I
will look at this!
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