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Date:      Fri, 6 Mar 2009 08:06:50 +0100 (CET)
From:      "Sebastian Mellmann" <sebastian.mellmann@net.t-labs.tu-berlin.de>
To:        "Luigi Rizzo" <rizzo@iet.unipi.it>
Cc:        freebsd-ipfw@freebsd.org
Subject:   Re: ipfw (dummynet) adds delay, but not configured to do so
Message-ID:  <64393.62.206.221.107.1236323210.squirrel@anubis.getmyip.com>
In-Reply-To: <20090306070011.GA94585@onelab2.iet.unipi.it>
References:  <49AED3B1.1060209@net.t-labs.tu-berlin.de> <20090304210017.GA29615@onelab2.iet.unipi.it> <20090306153751.D71460@sola.nimnet.asn.au> <20090306070011.GA94585@onelab2.iet.unipi.it>

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>> Secondly, apropos Sebastian's experience, should this say "The value
>> (even if 0) is rounded to the next multiple of the clock tick .." ?
>> ^^^^^^^^^^^
>
> 0 is rounded to 0 so that's not an issue.
> The delay Sebastian is seeing comes from the babdnwidth limitation,
> which is causing a non-zero "transmission time" which is rounded up.

Let me get this right:

When I configure a pipe with bandwidth limitations, I'll always get some
additional delay when a packet passes this pipe?

> 	cheers
> 	luigi


Regards,
Sebastian




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