单线ADSL带宽4M，线路损耗后实际速度3.5M左右，上传350k左右，由于ADSL满速下载、上传速度会变慢，配置ROS最高上传、下载不得超过总带宽90%，QOS配置如下：
首先分类标记上传、下载数据：
/ip firewall mangle小数据
add chain=prerouting action=mark-connection new-connection-mark=Small-conn passthrough=yes protocol=icmp comment=Small add chain=prerouting action=mark-connection new-connection-mark=Small-conn passthrough=yes protocol=udp dst-port=53 add chain=postrouting action=mark-connection new-connection-mark=Small-conn passthrough=yes protocol=udp dst-port=53 add chain=prerouting action=mark-connection new-connection-mark=Small-conn passthrough=yes protocol=udp dst-port=123 add chain=postrouting action=mark-packet new-packet-mark=Small-up passthrough=no out-interface=pppoe-out1 connection-mark=Small-conn add chain=prerouting action=mark-packet new-packet-mark=Small-up passthrough=no in-interface=bridge-local connection-mark=Small-conn add chain=prerouting action=mark-packet new-packet-mark=Small-down passthrough=no in-interface=pppoe-out1 connection-mark=Small-conn
SSH及VPN
add chain=prerouting action=mark-connection new-connection-mark=SSH-conn passthrough=yes protocol=tcp dst-port=22 comment=SSH add chain=prerouting action=mark-connection new-connection-mark=SSH-conn passthrough=yes protocol=tcp dst-port=23 add chain=prerouting action=mark-packet new-packet-mark=SSH-up passthrough=no in-interface=bridge-local connection-mark=SSH-conn add chain=prerouting action=mark-packet new-packet-mark=SSH-down passthrough=no in-interface=pppoe-out1 connection-mark=SSH-conn
网页数据
add chain=prerouting action=mark-connection new-connection-mark=HTTP-conn passthrough=yes protocol=tcp dst-port=80 comment=HTTP add chain=prerouting action=mark-connection new-connection-mark=HTTP-conn passthrough=yes protocol=tcp dst-port=443 add chain=prerouting action=mark-packet new-packet-mark=HTTP-up passthrough=no in-interface=bridge-local connection-mark=HTTP-conn add chain=prerouting action=mark-packet new-packet-mark=HTTP-down passthrough=no in-interface=pppoe-out1 connection-mark=HTTP-conn
其它
add chain=prerouting action=mark-connection new-connection-mark=Other-conn passthrough=yes comment=Other add chain=prerouting action=mark-packet new-packet-mark=Other-up passthrough=no in-interface=bridge-local connection-mark=Other-conn add chain=prerouting action=mark-packet new-packet-mark=Other-down passthrough=no in-interface=pppoe-out1 connection-mark=Other-conn
新建队列类型为PCQ：
#pcq-rate为每个了数据流最大速度，0为按数据流数公平分配带宽，pcq-limit为每一数据流队列长度；pcq-total-limit不能小于内网主机数*pcq-limit。
/queue type add name="Small-down" kind=pcq pcq-rate=0 pcq-limit=50 pcq-classifier=dst-address pcq-total-limit=2000 add name="Small-up" kind=pcq pcq-rate=50k pcq-limit=50 pcq-classifier=src-address pcq-total-limit=2000 add name="SSH-down" kind=pcq pcq-rate=0 pcq-limit=50 pcq-classifier=dst-address pcq-total-limit=2000 add name="SSH-up" kind=pcq pcq-rate=50k pcq-limit=50 pcq-classifier=src-address pcq-total-limit=2000 add name="HTTP-down" kind=pcq pcq-rate=0 pcq-limit=50 pcq-classifier=dst-address pcq-total-limit=2000 add name="HTTP-up" kind=pcq pcq-rate=80k pcq-limit=50 pcq-classifier=src-address pcq-total-limit=2000 add name="Other-down" kind=pcq pcq-rate=0 pcq-limit=50 pcq-classifier=dst-address pcq-total-limit=2000 add name="Other-up" kind=pcq pcq-rate=30k pcq-limit=50 pcq-classifier=src-address pcq-total-limit=2000
添加队列树调用之前标记的数据包设置优先级，队列类型设置为之前新建的PCQ类型。
/queue tree add name="Parent-up" parent=global-out limit-at=330k max-limit=330k add name="Parent-down" parent=global-in limit-at=3300k max-limit=3300k add name=Small-up parent=Parent-up packet-mark=Small-up limit-at=70k max-limit=150k queue=Small-up priority=1 add name=Small-down parent=Parent-down packet-mark=Small-down limit-at=500k max-limit=1000k queue=Small-down priority=1 add name=SSH-up parent=Parent-up packet-mark=SSH-up limit-at=70k max-limit=200k queue=SSH-up priority=2 add name=SSH-down parent=Parent-down packet-mark=SSH-down limit-at=500k max-limit=1000k queue=SSH-down priority=2 add name=HTTP-up parent=Parent-up packet-mark=HTTP-up limit-at=150k max-limit=200k queue=HTTP-up priority=3 add name=HTTP-down parent=Parent-down packet-mark=HTTP-down limit-at=2000k max-limit=3000k queue=HTTP-down priority=3 add name=Other-up parent=Parent-up packet-mark=Other-up limit-at=20k max-limit=80k queue=Other-up priority=4 add name=Other-down parent=Parent-down packet-mark=Other-down limit-at=200k max-limit=2000k queue=Other-down priority=4
ROS路由设置HTB+PCQ流量控制的一些注意事项：
1.WAN限制上传，按源地址分组；LAN限制下载，按目标地址分组；
2.passthrough是否继续向下匹配此链接，选择yes会向下匹配，下面规则如有匹配标记会改变；
3.在HTB首先满足Limit At，在父级有剩余带宽的前提下才会Max Limit，优先级高的队列优先获得Max Limit；
4.mark-connection的数据包是双向的，然后通过mark-pack区分上传和下载；
5.global-in在DNAT后，global-out在SNAT前，分别可匹配目标地址和源地址。
