Why isn't ipfw correctly limiting the bandwidth [Mac OSX]?
I've just played around with the ipfw command on a Mac and tried to limit the bandwidth to 1MBit/s.

    sudo ipfw add pipe 1 ip from any to me
    sudo ipfw pipe 1 config bw 1MBit/s

These are the statements I'm using. ipfw indeed limits the bandwidth drastically but according to speedtest.net only to ~7.7 Mbps on a 100 Mbps line. 
With a restriction to 3MBit/s the effective download is ~23.13 Mbps.
Apparently the ipfw always uses a **factor ~7.7** of the given limit. 
With a limit of 4 Mbps the effective speed is ~30,84 Mbps, with 8 Mbps it's ~61.6 Mbps and so on...

Anyone knows why this is the reason?
Is it a bug or do I use the statement wrong?

Thank you
Why isn't ipfw correctly limiting the bandwidth [Mac OSX]?
===

I've just played around with the ipfw command on a Mac and tried to limit the bandwidth to 1MBit/s.

    sudo ipfw add pipe 1 ip from any to me
    sudo ipfw pipe 1 config bw 1MBit/s

These are the statements I'm using. ipfw indeed limits the bandwidth drastically but according to speedtest.net only to ~7.7 Mbps on a 100 Mbps line. 
With a restriction to 3MBit/s the effective download is ~23.13 Mbps.
Apparently the ipfw always uses a **factor ~7.7** of the given limit. 
With a limit of 4 Mbps the effective speed is ~30,84 Mbps, with 8 Mbps it's ~61.6 Mbps and so on...

Anyone knows why this is the reason?
Is it a bug or do I use the statement wrong?

Thank you