Hi,
I currently operate a traffic management / QoS system at my premises
with the following setup using htb/sfq. No default handle is selected
for various reasons (VPN traffic is tagged and accounted for before
flowing out and thus don’t want to count VPN traffic).
#QoS for Upload
tc qdisc del dev ppp0 root
tc qdisc add dev ppp0 root handle 1:0 htb r2q 1
tc class add dev ppp0 parent 1: classid 1:1 htb rate 900kbit ceil 900kbit
tc class add dev ppp0 parent 1:1 classid 1:10 htb rate 85kbit ceil
900kbit quantum 2824 mtu 1412 prio 1 #syn ack rst
tc class add dev ppp0 parent 1:1 classid 1:11 htb rate 410kbit ceil
900kbit quantum 2824 mtu 1412 prio 2 #VoIP/Ping/DNS/Timecritical
tc class add dev ppp0 parent 1:1 classid 1:12 htb rate 300kbit ceil
900kbit quantum 2824 mtu 1412 prio 3 #Interactive/Web/etc
tc class add dev ppp0 parent 1:1 classid 1:13 htb rate 105kbit ceil
900kbit quantum 2824 mtu 1412 prio 4 #Bulk/Other
tc qdisc add dev ppp0 parent 1:10 handle 10: sfq perturb 10
tc qdisc add dev ppp0 parent 1:11 handle 11: sfq perturb 10
tc qdisc add dev ppp0 parent 1:12 handle 12: sfq perturb 10 limit 2
tc qdisc add dev ppp0 parent 1:13 handle 13: sfq perturb 10 limit 2
tc filter add dev ppp0 parent 1:0 protocol ip prio 1 handle 10 fw flowid
1:10
tc filter add dev ppp0 parent 1:0 protocol ip prio 2 handle 11 fw flowid
1:11
tc filter add dev ppp0 parent 1:0 protocol ip prio 3 handle 12 fw flowid
1:12
tc filter add dev ppp0 parent 1:0 protocol ip prio 4 handle 13 fw flowid
1:13
#QoS for Download
tc qdisc del dev eth1 root
tc qdisc add dev eth1 root handle 1:0 htb r2q 1
class add dev eth1 parent 1: classid 1:1 htb rate 15000kbit ceil 15000kbit
tc class add dev eth1 parent 1:1 classid 1:10 htb rate 85kbit ceil
15000kbit quantum 2824 mtu 1412 prio 1 #syn ack rst
tc class add dev eth1 parent 1:1 classid 1:11 htb rate 460kbit ceil
15000kbit quantum 2824 mtu 1412 prio 2 #VoIP/Ping/DNS/Time critical
tc class add dev eth1 parent 1:1 classid 1:12 htb rate 5955kbit ceil
15000kbit quantum 2824 mtu 1412 prio 3 #Interactive/Web/etc
tc class add dev eth1 parent 1:1 classid 1:13 htb rate 8500kbit ceil
15000kbit quantum 2824 mtu 1412 prio 4 #Bulk/Other
tc qdisc add dev eth1 parent 1:10 handle 10: sfq perturb 10
tc qdisc add dev eth1 parent 1:11 handle 11: sfq perturb 10
tc qdisc add dev eth1 parent 1:12 handle 12: sfq perturb 10 limit 10
tc qdisc add dev eth1 parent 1:13 handle 13: sfq perturb 10 limit 10
tc filter add dev eth1 parent 1:0 protocol ip prio 1 handle 10 fw flowid
1:10
tc filter add dev eth1 parent 1:0 protocol ip prio 2 handle 11 fw flowid
1:11
tc filter add dev eth1 parent 1:0 protocol ip prio 3 handle 12 fw flowid
1:12
tc filter add dev eth1 parent 1:0 protocol ip prio 4 handle 13 fw flowid
1:13
The above system coupled with carefully crafted iptables rules set is
working quite well however when upload is being actively managed
sometimes its taking a while before jitter for time critical flows
settles down. I have therefore been investigating hfsc... Hfsc appears
to be working for low numbers of flows, however once flows increase and
packets backlog in the system overall latency is climbing skywards since
the backlog is getting too large before it appears to drop packets. I
have attempted to replicate my htb system where non marked traffic flows
out without restrictions however hfsc drops unclassified traffic - thus
my attempted solution below (class 1:14) which seems to be working properly.
#QoS for Upload
tc qdisc del dev ppp0 root
tc qdisc add dev ppp0 root handle 1:0 hfsc default 14
tc class add dev ppp0 parent 1:0 classid 1:1 hfsc sc rate 100mbit ul
rate 100mbit
tc class add dev ppp0 parent 1:1 classid 1:2 hfsc sc rate 900kbit ul
rate 900kbit
tc class add dev ppp0 parent 1:2 classid 1:10 hfsc sc rate 85kbit #syn
ack rst
tc class add dev ppp0 parent 1:2 classid 1:11 hfsc sc umax 1412b dmax
20ms rate 410kbit # Time critical
tc class add dev ppp0 parent 1:2 classid 1:12 hfsc sc rate 300kbit
#Interactive
tc class add dev ppp0 parent 1:2 classid 1:13 hfsc sc rate 105kbit #bulk
tc class add dev ppp0 parent 1:1 classid 1:14 hfsc sc rate 100mbit
tc qdisc add dev ppp0 parent 1:10 handle 1010: sfq
tc qdisc add dev ppp0 parent 1:11 handle 1011: sfq
tc qdisc add dev ppp0 parent 1:12 handle 1012: sfq limit 5
tc qdisc add dev ppp0 parent 1:13 handle 1013: sfq limit 5
tc qdisc add dev ppp0 parent 1:14 handle 1014: pfifo
tc filter add dev ppp0 parent 1:0 protocol ip prio 1 handle 10 fw flowid
1:10
tc filter add dev ppp0 parent 1:0 protocol ip prio 2 handle 11 fw flowid
1:11
tc filter add dev ppp0 parent 1:0 protocol ip prio 3 handle 12 fw flowid
1:12
tc filter add dev ppp0 parent 1:0 protocol ip prio 4 handle 13 fw flowid
1:13
#QoS for Download
tc qdisc del dev eth1 root
tc qdisc add dev eth1 root handle 1:0 hfsc default 14
tc class add dev eth1 parent 1:0 classid 1:1 hfsc sc rate 100mbit ul m2
100mbit
tc class add dev eth1 parent 1:1 classid 1:2 hfsc sc rate 18000kbit ul
m2 18000kbit
tc class add dev eth1 parent 1:2 classid 1:10 hfsc sc rate 85kbit #syn
ack rst
tc class add dev eth1 parent 1:2 classid 1:11 hfsc sc umax 1412b dmax
20ms rate 460kbit #Time critical
tc class add dev eth1 parent 1:2 classid 1:12 hfsc sc rate 5955kbit
#Interactive
tc class add dev eth1 parent 1:2 classid 1:13 hfsc sc rate 11500kbit #Bulk
tc class add dev eth1 parent 1:1 classid 1:14 hfsc sc rate 100mbit
tc filter add dev eth1 parent 1:0 protocol ip prio 1 handle 10 fw flowid
1:10
tc filter add dev eth1 parent 1:0 protocol ip prio 2 handle 11 fw flowid
1:11
tc filter add dev eth1 parent 1:0 protocol ip prio 3 handle 12 fw flowid
1:12
tc filter add dev eth1 parent 1:0 protocol ip prio 4 handle 13 fw flowid
1:13
Does anybody have any tips regarding getting this working as well or
better than my existing htb based system?
Alan
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