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Simple script for being able to look at pie harder Also a mildly more robust and correct classifier
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Dave Taht
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May 18, 2013
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| Original file line number | Diff line number | Diff line change |
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| #!/bin/sh | ||
| # Cero3 Shaper | ||
| # A 3 bin tc_codel and ipv6 enabled shaping script for | ||
| # ethernet gateways, with an eye towards working well | ||
| # with wireless with uplinks in the 2Mbit to 25Mbit | ||
| # range. It ain't done yet, and is cerowrt specific | ||
| # in that it depends on clearly identifying the | ||
| # internal interfaces via a pattern match. | ||
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| # Copyright (C) 2012 Michael D Taht | ||
| # GPLv2 | ||
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| # Compared to the complexity that debloat had become | ||
| # this cleanly shows a means of going from diffserv marking | ||
| # to prioritization using the current tools (ip(6)tables | ||
| # and tc. I note that the complexity of debloat exists for | ||
| # a reason, and it is expected that script is run first | ||
| # to setup various other parameters such as BQL and ethtool. | ||
| # (And that the debloat script has setup the other interfaces) | ||
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| # You need to jiggle these parameters. Note limits are tuned towards a <10Mbit uplink <60Mbup down | ||
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| UPLINK=2000 | ||
| DOWNLINK=20000 | ||
| DEV=ifb0 | ||
| QDISC=pie # pie | ||
| IFACE=ge00 | ||
| DEPTH=42 | ||
| TC=~d/git/iproute2/tc/tc | ||
| FLOWS=8000 | ||
| PERTURB="perturb 0" # Permutation is costly, disable | ||
| FLOWS=16000 # | ||
| BQL_MAX=3000 # it is important to factor this into the RED calc | ||
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| CEIL=$UPLINK | ||
| MTU=1500 | ||
| ADSLL="" | ||
| # PPOE=yes | ||
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| #config interface ge00 | ||
| # option classgroup "Default" | ||
| # option enabled 0 | ||
| # option upload 128 | ||
| # option download 1024 | ||
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| # uci get aqm.enable | ||
| # | ||
| # You shouldn't need to touch anything here | ||
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| if [ -s "$PPOE" ] | ||
| then | ||
| OVERHEAD=40 | ||
| LINKLAYER=adsl | ||
| ADSLL="linklayer ${LINKLAYER} overhead ${OVERHEAD}" | ||
| fi | ||
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| ipt() { | ||
| iptables $* | ||
| ip6tables $* | ||
| } | ||
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| do_modules() { | ||
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| insmod sch_$QDISC | ||
| insmod sch_ingress | ||
| insmod act_mirred | ||
| insmod cls_fw | ||
| insmod sch_htb | ||
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| } | ||
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| fc() { | ||
| PARENT=$1 | ||
| TOS=$2 | ||
| CLASSID=$3 | ||
| tc filter add dev $interface protocol ip parent $PARENT prio $prio u32 match ip tos $TOS 0xfc classid $CLASSID | ||
| prio=$(($prio + 1)) | ||
| tc filter add dev $interface protocol ipv6 parent $PARENT prio $prio u32 match ip6 priority $TOS 0xfc classid $CLASSID | ||
| prio=$(($prio + 1)) | ||
| } | ||
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| # This could be a complete diffserv implementation | ||
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| diffserv() { | ||
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| interface=$1 | ||
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| prio=1 | ||
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| # Catchall | ||
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| tc filter add dev $interface parent 1:0 protocol all prio 999 u32 \ | ||
| match ip protocol 0 0x00 flowid 1:12 | ||
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| # Find the most common matches fast | ||
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| fc 1:0 0x00 1:12 # BE | ||
| fc 1:0 0x20 1:13 # CS1 | ||
| fc 1:0 0x10 1:11 # IMM | ||
| fc 1:0 0xb8 1:11 # EF | ||
| fc 1:0 0xc0 1:11 # CS3 | ||
| fc 1:0 0xe0 1:11 # CS6 | ||
| fc 1:0 0x90 1:11 # AF42 (mosh) | ||
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| # Arp traffic | ||
| tc filter add dev $interface parent 1:0 protocol arp prio $prio handle 1 fw classid 1:11 | ||
| prio=$(($prio + 1)) | ||
| } | ||
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| ipt_setup() { | ||
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| ipt -t mangle -F | ||
| ipt -t mangle -N QOS_MARK | ||
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| ipt -t mangle -A QOS_MARK -j MARK --set-mark 0x2 | ||
| # You can go further with classification but... | ||
| ipt -t mangle -A QOS_MARK -m dscp --dscp-class CS1 -j MARK --set-mark 0x3 | ||
| ipt -t mangle -A QOS_MARK -m dscp --dscp-class CS3 -j MARK --set-mark 0x1 | ||
| ipt -t mangle -A QOS_MARK -m dscp --dscp-class CS6 -j MARK --set-mark 0x1 | ||
| ipt -t mangle -A QOS_MARK -m dscp --dscp-class EF -j MARK --set-mark 0x1 | ||
| ipt -t mangle -A QOS_MARK -m dscp --dscp-class AF42 -j MARK --set-mark 0x1 | ||
| ipt -t mangle -A QOS_MARK -m tos --tos Minimize-Delay -j MARK --set-mark 0x1 | ||
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| # and it might be a good idea to do it for udp tunnels too | ||
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| # Turn it on. Preserve classification if already performed | ||
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| ipt -t mangle -A POSTROUTING -o $DEV -m mark --mark 0x00 -g QOS_MARK | ||
| ipt -t mangle -A POSTROUTING -o $IFACE -m mark --mark 0x00 -g QOS_MARK | ||
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| # The Syn optimization was nice but fq_codel does it for us | ||
| # ipt -t mangle -A PREROUTING -i s+ -p tcp -m tcp --tcp-flags SYN,RST,ACK SYN -j MARK --set-mark 0x01 | ||
| # Not sure if this will work. Encapsulation is a problem period | ||
| ipt -t mangle -A PREROUTING -i vtun+ -p tcp -j MARK --set-mark 0x2 # tcp tunnels need ordering | ||
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| # Emanating from router, do a little more optimization | ||
| # but don't bother with it too much. | ||
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| ipt -t mangle -A OUTPUT -p udp -m multiport --ports 123,53 -j DSCP --set-dscp-class AF42 | ||
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| #Not clear if the second line is needed | ||
| #ipt -t mangle -A OUTPUT -o $IFACE -g QOS_MARK | ||
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| } | ||
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| # TC rules | ||
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| egress() { | ||
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| CEIL=${UPLINK} | ||
| PRIO_RATE=`expr $CEIL / 3` # Ceiling for prioirty | ||
| BE_RATE=`expr $CEIL / 6` # Min for best effort | ||
| BK_RATE=`expr $CEIL / 9` # Min for background | ||
| BE_CEIL=`expr $CEIL - 64` # A little slop at the top | ||
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| R2Q="" | ||
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| if [ "$CEIL" -lt 1000 ] | ||
| then | ||
| R2Q="rtq 1" | ||
| fi | ||
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| tc qdisc del dev $IFACE root | ||
| tc qdisc add dev $IFACE root handle 1: htb ${RTQ} default 12 | ||
| tc class add dev $IFACE parent 1: classid 1:1 htb rate ${CEIL}kbit ceil ${CEIL}kbit $ADSLL | ||
| tc class add dev $IFACE parent 1:1 classid 1:10 htb rate ${CEIL}kbit ceil ${CEIL}kbit prio 0 $ADSLL | ||
| tc class add dev $IFACE parent 1:1 classid 1:11 htb rate 128kbit ceil ${PRIO_RATE}kbit prio 1 $ADSLL | ||
| tc class add dev $IFACE parent 1:1 classid 1:12 htb rate ${BE_RATE}kbit ceil ${BE_CEIL}kbit prio 2 $ADSLL | ||
| tc class add dev $IFACE parent 1:1 classid 1:13 htb rate ${BK_RATE}kbit ceil ${BE_CEIL}kbit prio 3 $ADSLL | ||
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| $TC qdisc add dev $IFACE parent 1:11 handle 110: $QDISC limit 600 noecn | ||
| $TC qdisc add dev $IFACE parent 1:12 handle 120: $QDISC limit 600 noecn | ||
| $TC qdisc add dev $IFACE parent 1:13 handle 130: $QDISC limit 600 noecn | ||
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| tc filter add dev $IFACE parent 1:0 protocol ip prio 1 handle 1 fw classid 1:11 | ||
| tc filter add dev $IFACE parent 1:0 protocol ip prio 2 handle 2 fw classid 1:12 | ||
| tc filter add dev $IFACE parent 1:0 protocol ip prio 3 handle 3 fw classid 1:13 | ||
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| # ipv6 support. Note that the handle indicates the fw mark bucket that is looked for | ||
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| tc filter add dev $IFACE parent 1:0 protocol ipv6 prio 4 handle 1 fw classid 1:11 | ||
| tc filter add dev $IFACE parent 1:0 protocol ipv6 prio 5 handle 2 fw classid 1:12 | ||
| tc filter add dev $IFACE parent 1:0 protocol ipv6 prio 6 handle 3 fw classid 1:13 | ||
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| # Arp traffic | ||
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| tc filter add dev $IFACE parent 1:0 protocol arp prio 7 handle 1 fw classid 1:11 | ||
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| } | ||
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| ingress() { | ||
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| CEIL=$DOWNLINK | ||
| PRIO_RATE=`expr $CEIL / 3` # Ceiling for prioirty | ||
| BE_RATE=`expr $CEIL / 3` # Min for best effort | ||
| BK_RATE=`expr $CEIL / 6` # Min for background | ||
| BE_CEIL=`expr $CEIL - 64` # A little slop at the top | ||
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| R2Q="" | ||
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| tc qdisc del dev $IFACE handle ffff: ingress | ||
| tc qdisc add dev $IFACE handle ffff: ingress | ||
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| tc qdisc del dev $DEV root | ||
| tc qdisc add dev $DEV root handle 1: htb ${RTQ} default 12 | ||
| tc class add dev $DEV parent 1: classid 1:1 htb rate ${CEIL}kbit ceil ${CEIL}kibit $ADSLL | ||
| tc class add dev $DEV parent 1:1 classid 1:10 htb rate ${CEIL}kbit ceil ${CEIL}kibit prio 0 $ADSLL | ||
| tc class add dev $DEV parent 1:1 classid 1:11 htb rate 32kbit ceil ${PRIO_RATE}kibit prio 1 $ADSLL | ||
| tc class add dev $DEV parent 1:1 classid 1:12 htb rate ${BE_RATE}kbit ceil ${BE_CEIL}kibit prio 2 $ADSLL | ||
| tc class add dev $DEV parent 1:1 classid 1:13 htb rate ${BK_RATE}kbit ceil ${BE_CEIL}kibit prio 3 $ADSLL | ||
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| # I'd prefer to use a pre-nat filter but that causes permutation... | ||
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| $TC qdisc add dev $DEV parent 1:11 handle 110: $QDISC limit 1000 ecn | ||
| $TC qdisc add dev $DEV parent 1:12 handle 120: $QDISC limit 1000 ecn | ||
| $TC qdisc add dev $DEV parent 1:13 handle 130: $QDISC limit 1000 ecn | ||
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| diffserv ifb0 | ||
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| ifconfig ifb0 up | ||
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| # redirect all IP packets arriving in $IFACE to ifb0 | ||
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| $TC filter add dev $IFACE parent ffff: protocol all prio 10 u32 \ | ||
| match u32 0 0 flowid 1:1 action mirred egress redirect dev $DEV | ||
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| } | ||
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| do_modules | ||
| ipt_setup | ||
| egress | ||
| ingress | ||
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| # References: | ||
| # This alternate shaper attempts to go for 1/u performance in a clever way | ||
| # http://git.coverfire.com/?p=linux-qos-scripts.git;a=blob;f=src-3tos.sh;hb=HEAD | ||
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| # Comments | ||
| # This does the right thing with ipv6 traffic. | ||
| # It also does not rehash with sfq skewing streams | ||
| # It also tries to leverage diffserv to some sane extent. In particular, | ||
| # the 'priority' queue is limited to 33% of the total, so EF, and IMM traffic | ||
| # cannot starve other types. The rfc suggested 30%. 30% is probably | ||
| # a lot in today's world. | ||
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| # Flaws | ||
| # Many! | ||
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| # Why 42? | ||
| # Lucky number. | ||
| # the sum of the number of packets here + htb + the ar71xx device driver | ||
| # ~= 50 the core number used by theorists everywhere. | ||
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