Dear all, I try to use TC CBQ to prioritise two classes of traffic (say premium and best effort) into an aggregate trunk of limited size (i.e. less than the physical link speed). The CBQ function works fine if the aggregate bandwidth is under 200Mbps. If the aggregate bandwidth is set higher, say, 300Mbit, both classes of traffic would be sent out without rate limiting. Is this related to the HZ value of kernel? I have already set the HZ value to be 1024. Or should I use something rather than CBQ for the job (e.g. HTB)? Any comments/suggestions are much appreciated... Please see below for details... Best Regards, Jonathan TC script: aggregate_bw=200Mbit or 300Mbit tc qdisc add dev eth2 root handle 1:0 cbq bandwidth 1000Mbit avpkt 1516 allot 1514 # rate limit the aggregate tc class add dev eth2 parent 1:0 classid 1:1 cbq bandwidth 1000Mbit rate $aggregate_bw weight 20Mbit prio 1 allot 1514 maxburst 20 avpkt 1516 bounded isolated # premium traffic tc class add dev eth2 parent 1:1 classid 1:2 cbq bandwidth $aggregate_bw rate $aggregate_bw weight 20Mbit prio 2 allot 1514 maxburst 20 avpkt 1516 tc qdisc add dev eth2 parent 1:2 pfifo limit 2 tc filter add dev eth2 parent 1:0 protocol all prio 1 u32 match u32 0x00000a00 0x00000e00 at 0 classid 1:2 # best effort traffic (I set the rate to be small and let it borrow traffic from premium traffic) tc class add dev eth2 parent 1:1 classid 1:3 cbq bandwidth $aggregate_bw rate 12Kbit weight 1Kbit prio 8 allot 1514 maxburst 20 avpkt 1516 tc qdisc add dev eth2 parent 1:3 pfifo limit 20 tc filter add dev eth2 parent 1:0 protocol all prio 1 u32 match u32 0x00000000 0x00000e00 at 0 classid 1:3 Linux platform: Hardware: P4 2.8GHz 256M RAM Linux distribution: Fedora Core 1 (kernel 2.4.22) - : send the line "unsubscribe linux-net" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
