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Buffer Bloat » Historique » Version 15

Laurent GUERBY, 26/12/2011 21:48

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h1. Buffer Bloat
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* http://bufferbloat.net
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* http://queue.acm.org/detail.cfm?id=2071893
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* via obinou change default queue : http://www.bufferbloat.net/issues/305
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* BSD Add the Enhanced Round Trip Time (ERTT) Khelp module to allow support for delay-based congestion control algorithms. http://caia.swin.edu.au/freebsd/5cc/
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* http://lwn.net/Articles/470641/
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* http://en.wikipedia.org/wiki/Datagram_Congestion_Control_Protocol
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h2. QoS
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* tc qdisc par IP source
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http://lists.tetalab.org/pipermail/tetaneutral/2011-April/000129.html
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* ebtable packet flow chart http://ebtables.sourceforge.net/br_fw_ia/PacketFlow.png
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* tc openwrt theory http://wiki.openwrt.org/doc/howto/tc/tc.theory
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* tc openwrt howto http://wiki.openwrt.org/doc/howto/tc
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* doc HTB http://luxik.cdi.cz/~devik/qos/htb/manual/userg.htm
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* http://www.faqs.org/docs/Linux-HOWTO/ADSL-Bandwidth-Management-HOWTO.html
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* [PATCH net-next] sch_red: Adaptative RED AQM http://www.spinics.net/lists/netdev/msg182750.html
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* http://icir.org/floyd/papers/adaptiveRed.pdf
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* QFQ http://info.iet.unipi.it/~luigi/qfq/
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Partage de bande passante ADSL
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<pre>
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# Version du 20111207
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function do_qos {
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  tc qdisc add dev $DEV root handle 1: htb default 1
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  tc class add dev $DEV parent 1: classid 1:1 htb rate $RATE
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  for IP in $IP_LIST; do
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    tc class add dev $DEV parent 1:1 classid 1:$IP htb rate 1kbit ceil $RATE
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    tc filter add dev $DEV protocol ip parent 1:0 prio 1 u32 match ip $DIR 91.224.148.$IP flowid 1:$IP
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  done
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}
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DIR=dst #on gw then RATE= ADSL download speed
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#DIR=src #on local machine then RATE= ADSL upload speed
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DEV=tapstg
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RATE=11000kbit # src 700kbit
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IP_LIST=$(seq 129 144)
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do_qos
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DEV=tapthd
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RATE=5500kbit # src TODO
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IP_LIST=$(seq 194 207)
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do_qos
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DEV=tapmon
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RATE=480kbit # src 96kbit
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IP_LIST=$(seq 114 115)
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do_qos
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</pre>
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Pour supprimer un qdisc :
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<pre>
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tc qdisc del dev tapxxx root
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</pre>
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Pour afficher :
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<pre>
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tc -p -s -d qdisc show dev tapxxx
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tc -p -s -d class show dev tapxxx
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tc -p -s -d filter show dev tapxxx
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</pre>
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Documentation :
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<pre>
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# tc qdisc add htb help
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What is "help"?
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Usage: ... qdisc add ... htb [default N] [r2q N]
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 default  minor id of class to which unclassified packets are sent {0}
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 r2q      DRR quantums are computed as rate in Bps/r2q {10}
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 debug    string of 16 numbers each 0-3 {0}
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... class add ... htb rate R1 [burst B1] [mpu B] [overhead O]
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                      [prio P] [slot S] [pslot PS]
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                      [ceil R2] [cburst B2] [mtu MTU] [quantum Q]
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 rate     rate allocated to this class (class can still borrow)
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 burst    max bytes burst which can be accumulated during idle period {computed}
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 mpu      minimum packet size used in rate computations
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 overhead per-packet size overhead used in rate computations
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 linklay  adapting to a linklayer e.g. atm
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 ceil     definite upper class rate (no borrows) {rate}
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 cburst   burst but for ceil {computed}
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 mtu      max packet size we create rate map for {1600}
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 prio     priority of leaf; lower are served first {0}
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 quantum  how much bytes to serve from leaf at once {use r2q}
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TC HTB version 3.3
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</pre>