Hello everyone, I'm a newbie experimenting with CBQ shaping and am facing a few problems. Can any of you please help? TEST SETUP: +---------------+ +----------------+ | 10.0.0.103 |----------->| 10.0.0.102 | +---------------+ +----------------+ 10.0.0.103: Linux, 100Mbit/s NIC 10.0.0.102: Windows, 100Mbit/s NIC, iperf tcp server (ports 2000 and 2001) WHAT I WANT TO DO: 1. Traffic from 10.0.0.103 to 10.0.0.102 port 2000 should always receive at least 60Mbit/s regardless of presence of other traffic. 2. In the absence of traffic to 10.0.0.102 port 2000, all other traffic should use all available bandwidth CBQ SETUP 1: #!/bin/bash # rate1 = 60Mbit/s RATE1=614400000 PRIO="prio 1" DEV="dev eth0" OPTION="allot 1514 maxburst 20 avpkt 1000" # reset qdiscs tc qdisc del $DEV root # root CBQ tc qdisc add $DEV root handle 10: cbq bandwidth 100mbit avpkt 1000 # 60 Mbit/s class tc class add $DEV parent 10:0 classid 10:1 cbq bandwidth 100mbit rate $RATE1 $OPTION $PRIO borrow # add filter tc filter add $DEV parent 10:0 protocol ip prio 3 handle 1 fw flowid 10:1 # mark packets iptables -A OUTPUT -t mangle -p tcp --dport 2000 -d 10.0.0.102 -j MARK --set-mark 1 OBSERVED RESULTS FOR SETUP 1: 1. A single iperf session to 10.0.0.102 port 2000 for 40 seconds reports 93.1 Mbit/s 2. Two simultaneous iperf sessions to 10.0.0.102 on ports 2000 and 2001 for 40 seconds each report 48.4 Mbit/s and 44.3 Mbit/s respectively 3. "tc -s -d class show dev eth0" shows the 10:1 class processing packets and I assume port 2001 traffic uses the root qdisc. Is this assumption right? CBQ SETUP 2: I added a CBQ class 10:2 with a rate of 10240000, prio 3, borrow parameter, a filter to direct port 2001 traffic to 10:2 and iptables rules to assign fwmark. OBSERVED RESULTS FOR SETUP 2: Almost the same as above results with traffic being directed to appropriate classes. QUESTIONS: 1. What am I doing wrong? Why doesn't port 2000 traffic always receive at least 60 Mbit/s? 2. prio 1 offers higher priority than prio 3, right? Lower the number, higher the priority? 3. bandwidth parameter: I've seen examples where people always use the NIC bandwidth (100 Mbit/s) and some examples where people use the link bandwidth (say 6 Mbit/s for a DSL link). Which is right? 4. is it recommended that I have a class below the root CBQ and all other classes as sub classes of that class? Thanks! Muthu _______________________________________________ LARTC mailing list LARTC@xxxxxxxxxxxxxxx http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc
