dummynet and modem pipes
Luigi Rizzo
rizzo at icir.org
Fri Sep 5 11:25:00 PDT 2003
On Fri, Sep 05, 2003 at 09:50:39AM -0700, Yuchung Cheng wrote:
> 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
basically there is no way to accurately simulate modem compression.
As a rule of thumb, for bulk traffic you can think that the main
effect is the bandwidth changes (the exact ratio depends on the
type of traffic), whereas for interactive apps (e.g. rpc and the
like) more than compression what affects you is the additional
delay that the modem causes to decide that it is time to build&send
a new packet.
also you'd need to take care of ip compression, not just what
happens in the modem itself
cheers
luigi
> fake larger bandwidth, but do different traffic (html, jpg, mpg) affect
> the compression latency or compression rate significantly? tia
>
> -yuchung
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