>Date: Sat, 06 Apr 2002 14:01:33 +0100
>To: lartc@mailman.ds9a.nl
>From: Mark Beck <wilson99@lineone.net>
>Subject: Clarification required for Prio in CBQ dequeing order
>
>Hi,
>
>I have been modifying the Wonder shaper to include another queue. My
>understanding was packets would be de queued to hardware in the following
>order:
>
> cbq1 -> sfq10 > sfq20 > sfq30.
>
>Also we only move onto the next queue when the preceding one is empty.
>
>However is seems to be prio xx number that reflects the order packets are
>de queued not to what flowid they belong to.
>
>If I enter the commands below and ping my next hop with lots of traffic
>matching sport 10240 0x200.
>
># ICMP (ip protocol 1) in the interactive class 1:10 so we
># can do measurements & impress our friends:
>tc filter add dev $DEV parent 1:0 protocol ip prio 11 u32 \
> match ip protocol 1 0xff flowid 1:10
>tc filter add dev $DEV parent 1:0 protocol ip prio 24 u32 \
> match ip sport 10240 0x200 flowid 1:30
>
> Packets: Sent = 85, Received = 85, Lost = 0 (0% loss),
>Approximate round trip times in milli-seconds:
> Minimum = 20ms, Maximum = 145ms, Average = 79ms
>
>---------------------------------------------------------------------------------
>!! Now we change the bottom filter to prio4 in flowid 1:30
>
># ICMP (ip protocol 1) in the interactive class 1:10 so we
># can do measurements & impress our friends:
>tc filter add dev $DEV parent 1:0 protocol ip prio 11 u32 \
> match ip protocol 1 0xff flowid 1:10
>tc filter add dev $DEV parent 1:0 protocol ip prio 4 u32 \
> match ip sport 10240 0x200 flowid 1:30
>
> Packets: Sent = 127, Received = 127, Lost = 0 (0% loss),
>Approximate round trip times in milli-seconds:
> Minimum = 129ms, Maximum = 2405ms, Average = 475ms
>
>[root@box root]# tc -s qdisc
>qdisc sfq 30: dev ppp0 quantum 1500b perturb 10sec
> Sent 6040688 bytes 4199 pkts (dropped 0, overlimits 0)
> backlog 34p
>
> qdisc sfq 20: dev ppp0 quantum 1500b perturb 10sec
> Sent 75210 bytes 1167 pkts (dropped 0, overlimits 0)
>
> qdisc sfq 10: dev ppp0 quantum 1500b perturb 10sec
> Sent 317956 bytes 6133 pkts (dropped 0, overlimits 0)
>
> qdisc cbq 1: dev ppp0 rate 10Mbit (bounded,isolated) prio no-transmit
> Sent 6455294 bytes 11521 pkts (dropped 0, overlimits 26113)
> backlog 34p
> borrowed 0 overactions 0 avgidle 624 undertime 0
>
>Packets are sent to the correct flow but ICMP response is far worse!
>
>---------------------------------------------------------------------------------
>
>I know the filters are matching correctly as the right number of packets
>go to the correct flow. But could you please confirm if sfq10 should get
>de queued before sfq30.
>
>Thanks,
>Mark
>
>
>
>
>#!/bin/bash
>
># The Ultimate Setup For Your Internet Connection At Home
>#
>#
># Set the following values to somewhat less than your actual download
># and uplink speed. In kilobits
>DOWNLINK=800
>UPLINK=220
>DEV=ppp0
>
># clean existing down- and uplink qdiscs, hide errors
>tc qdisc del dev $DEV root 2> /dev/null > /dev/null
>tc qdisc del dev $DEV ingress 2> /dev/null > /dev/null
>
>###### uplink
>
># install root CBQ
>
>tc qdisc add dev $DEV root handle 1: cbq avpkt 1000 bandwidth 10mbit
>
># shape everything at $UPLINK speed - this prevents huge queues in your
># DSL modem which destroy latency:
># main class
>
>tc class add dev $DEV parent 1: classid 1:1 cbq rate ${UPLINK}kbit \
>allot 1500 prio 5 bounded isolated
>
># high prio class 1:10:
>
>tc class add dev $DEV parent 1:1 classid 1:10 cbq rate ${UPLINK}kbit \
> allot 1600 prio 1 avpkt 1000
>
># bulk and default class 1:20 - gets slightly less traffic,
># and a lower priority:
>
>tc class add dev $DEV parent 1:1 classid 1:20 cbq rate $[9*$UPLINK/10]kbit \
> allot 1600 prio 2 avpkt 1000
>
># ftp in 1:30: We send this shit last :)
>
>tc class add dev $DEV parent 1:1 classid 1:30 cbq rate $[9*$UPLINK/10]kbit \
> allot 1600 prio 3 avpkt 1000
>
># all get Stochastic Fairness:
>tc qdisc add dev $DEV parent 1:10 handle 10: sfq perturb 10
>tc qdisc add dev $DEV parent 1:20 handle 20: sfq perturb 10
>tc qdisc add dev $DEV parent 1:30 handle 30: sfq perturb 10
>
># To speed up downloads while an upload is going on, put ACK packets in
># the interactive class:
>
>tc filter add dev $DEV parent 1: protocol ip prio 10 u32 \
> match ip protocol 6 0xff \
> match u8 0x05 0x0f at 0 \
> match u16 0x0000 0xffc0 at 2 \
> match u8 0x10 0xff at 33 \
> flowid 1:10
>
>
>
># start filters
>
># TOS Minimum Delay (ssh, NOT scp) in 1:10:
>#tc filter add dev $DEV parent 1:0 protocol ip prio 10 u32 \
># match ip tos 0x10 0xff flowid 1:10
>
># ICMP (ip protocol 1) in the interactive class 1:10 so we
># can do measurements & impress our friends:
>tc filter add dev $DEV parent 1:0 protocol ip prio 11 u32 \
> match ip protocol 1 0xff flowid 1:10
>
># Halflife
>tc filter add dev $DEV parent 1:0 protocol ip prio 12 u32 \
> match tcp src 27005 0xffff flowid 1:10
>
>tc filter add dev $DEV parent 1:0 protocol ip prio 12 u32 \
> match udp src 27005 0xffff flowid 1:10
>
># tcp 22 (ssh)
>tc filter add dev $DEV parent 1:0 protocol ip prio 13 u32 \
> match tcp src 22 0xffff flowid 1:10
>
>
># tcp 23 (telnet)
>tc filter add dev $DEV parent 1:0 protocol ip prio 13 u32 \
> match tcp src 23 0xffff flowid 1:10
>
>
># UDP
>tc filter add dev $DEV parent 1:0 protocol ip prio 14 u32 \
> match ip protocol 17 0xff flowid 1:10
>
># ftp filter IP src ports 10240-10751
>
>tc filter add dev $DEV parent 1:0 protocol ip prio 24 u32 \
> match ip sport 10240 0x200 flowid 1:30
>
># rest is 'non-interactive' ie 'bulk' and ends up in 1:20.
>
>tc filter add dev $DEV parent 1: protocol ip prio 25 u32 \
> match ip dst 0.0.0.0/0 flowid 1:20
>
>[root@box root]#
