Hi there, I took home a 100 Mbit hub tonight and without shaping I now get 73 Mbit/sec across the line (I use iperf between my Linux machine and a FreeBSD box). So far, so good. But when I try to get say 20 Mbit outgoing, using: tc qdisc add dev eth1 root handle 10: cbq bandwidth 100Mbit avpkt 1000 tc class add dev eth1 parent 10:0 classid 10:1 cbq bandwidth 100Mbit \ rate 100Mbit allot 1514 weight 10Mbit prio 8 maxburst 200 avpkt 1000 tc class add dev eth1 parent 10:1 classid 10:200 cbq bandwidth 100Mbit \ rate 20Mbit allot 1514 weight 1Mbit prio 5 maxburst 200 avpkt 1000 bounded tc qdisc add dev eth1 parent 10:200 sfq quantum 1514b perturb 15 tc filter add dev eth1 parent 10:0 protocol ip prio 100 u32 match ip dst \ 0.0.0.0/0 flowid 10:200 I get about 9 to 10 Mbit/sec. When I try to get 50, I get 16. I am experimenting with the other parameters (avpkt, burstsize, weight) but can''t find a direct relation (yet). Is there any documentation about what parameter does what and how this influences the througput? Should I use other queuing-algorithms at these rates? I have tried to get RED working but to no avail. It complained about the parameters I tried to feed it... Well, I''ll go on experimenting a bit. I hope there are others that are trying shaping at these rates too, Clemens Sibon