Latency problem with traffic shaping (ipfw/dummynet)

Luigi Rizzo rizzo at
Sat Mar 20 14:19:23 PST 2004

cannot comment on the reason for the huge delay (but one
way to check what is going on is to change the pipe's bandwidth
and see if anything changes), but i see a big
misunderstanding on weights vs. priorities in your

> # Define our upload pipe
>         ${fwcmd} pipe 1 config bw 480Kbit/s
> # Define a high-priority queue
>         ${fwcmd} queue 1 config pipe 1 weight 100
> # Define a medium-high-priority queue
>         ${fwcmd} queue 2 config pipe 1 weight 99
> # Define a medium-low-priority queue
>         ${fwcmd} queue 3 config pipe 1 weight 98
> # Define a low-priority queue
>         ${fwcmd} queue 4 config pipe 1 weight 97

the above configuration means that if queue 1 is getting a bandwidth
X, then queue 2 will get 0.99X, queue 3 will get 0.98X, queue
4 will get 0.97X. Hardly matching any reasonable definition of high-mid-low


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