qos-scripts: replace sfq/red with fq_codel - massively improves latency under load
SVN-Revision: 31759
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2 changed files with 3 additions and 42 deletions
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@ -344,8 +344,7 @@ tc filter add dev $device parent ffff: protocol ip prio 1 u32 match u32 0 0 flow
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fi
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add_insmod cls_fw
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add_insmod sch_hfsc
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add_insmod sch_sfq
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add_insmod sch_red
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add_insmod sch_fq_codel
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cat <<EOF
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${INSMOD:+$INSMOD$N}${dev_up:+$dev_up
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@ -79,47 +79,9 @@ END {
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# leaf qdisc
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avpkt = 1200
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for (i = 1; i <= n; i++) {
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printf "tc qdisc add dev "device" parent 1:"class[i]"0 handle "class[i]"00: "
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# RED parameters - also used to determine the queue length for sfq
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# calculate min value. for links <= 256 kbit, we use 1500 bytes
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# use 50 ms queue length as min threshold for faster links
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# max threshold is fixed to 3*min
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base_pkt=3000
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base_rate=256
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min_lat=50
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if (maxrate[i] <= base_rate) min = base_pkt
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else min = int(maxrate[i] * 1024 / 8 * 0.05)
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max = 3 * min
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limit = (min + max) * 3
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if (qdisc[i] != "") {
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# user specified qdisc
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print qdisc[i] " limit " limit
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} else if (rtm1[i] > 0) {
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# rt class - use sfq
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print "sfq perturb 2 limit " limit
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} else {
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# non-rt class - use RED
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avpkt = pktsize[i]
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# don't use avpkt values less than 500 bytes
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if (avpkt < 500) avpkt = 500
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# if avpkt is too close to min, scale down avpkt to allow proper bursting
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if (avpkt > min * 0.70) avpkt *= 0.70
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# according to http://www.cs.unc.edu/~jeffay/papers/IEEE-ToN-01.pdf a drop
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# probability somewhere between 0.1 and 0.2 should be a good tradeoff
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# between link utilization and response time (0.1: response; 0.2: utilization)
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prob="0.12"
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rburst=int((2*min + max) / (3 * avpkt))
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if (rburst < 2) rburst = 2
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print "red min " min " max " max " burst " rburst " avpkt " avpkt " limit " limit " probability " prob " ecn"
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}
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print "tc qdisc add dev "device" parent 1:"class[i]"0 handle "class[i]"00: fq_codel"
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}
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# filter rule
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for (i = 1; i <= n; i++) {
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print "tc filter add dev "device" parent 1: prio "class[i]" protocol ip handle "class[i]"/0xff fw flowid 1:"class[i] "0"
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