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Date:      Fri, 5 Sep 2003 15:14:19 -0500
From:      "Shawn Barnhart" <>
To:        "Yuchung Cheng" <>, <>
Subject:   Re: dummynet and modem pipes
Message-ID:  <0cfe01c373ea$4a386fe0$>
References:  <>

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----- Original Message ----- 
From: "Yuchung Cheng" <>
To: <>
Sent: Friday, September 05, 2003 11:50
Subject: dummynet and modem pipes

> when simulating modem pipes using dummynet, how do we simulate the
> modem compressions? one way is to pick a compress rate, say 2, and setup
> fake larger bandwidth, but do different traffic (html, jpg, mpg) affect
> the compression latency or compression rate significantly? tia

Our Cisco RAS equipment usuall reports an "efficiency improvement factor" of
1.2, which I presume means a compression rate of about 20%.

I'd say give it 10% more bandwidth and call it a day, since a fair amount of
info will be precompressed and uncompressable.

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