Date: Fri, 5 Sep 2003 15:14:19 -0500 From: "Shawn Barnhart" <swb@grasslake.net> To: "Yuchung Cheng" <ycheng@cs.ucsd.edu>, <ipfw@freebsd.org> Subject: Re: dummynet and modem pipes Message-ID: <0cfe01c373ea$4a386fe0$62229fc0@ad.campbellmithun.com> References: <20030905095038.D28924@cs.ucsd.edu>
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----- Original Message ----- From: "Yuchung Cheng" <ycheng@cs.ucsd.edu> To: <ipfw@freebsd.org> 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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