| 1 | BEGIN { |
| 2 | dmax=100 |
| 3 | if (!(linespeed > 0)) linespeed = 128 |
| 4 | FS=":" |
| 5 | n = 0 |
| 6 | } |
| 7 | |
| 8 | ($1 != "") { |
| 9 | n++ |
| 10 | class[n] = $1 |
| 11 | prio[n] = $2 |
| 12 | avgrate[n] = ($3 * linespeed / 100) |
| 13 | pktsize[n] = $4 |
| 14 | delay[n] = $5 |
| 15 | maxrate[n] = ($6 * linespeed / 100) |
| 16 | qdisc[n] = $7 |
| 17 | filter[n] = $8 |
| 18 | } |
| 19 | |
| 20 | END { |
| 21 | allocated = 0 |
| 22 | maxdelay = 0 |
| 23 | |
| 24 | for (i = 1; i <= n; i++) { |
| 25 | # set defaults |
| 26 | if (!(pktsize[i] > 0)) pktsize[i] = 1500 |
| 27 | if (!(prio[i] > 0)) prio[i] = 1 |
| 28 | |
| 29 | allocated += avgrate[i] |
| 30 | sum_prio += prio[i] |
| 31 | if ((avgrate[i] > 0) && !(delay[i] > 0)) { |
| 32 | sum_rtprio += prio[i] |
| 33 | } |
| 34 | } |
| 35 | |
| 36 | # allocation of m1 in rt classes: |
| 37 | # sum(d * m1) must not exceed dmax * (linespeed - allocated) |
| 38 | dmax = 0 |
| 39 | for (i = 1; i <= n; i++) { |
| 40 | if (avgrate[i] > 0) { |
| 41 | rtm2[i] = avgrate[i] |
| 42 | if (delay[i] > 0) { |
| 43 | d[i] = delay[i] |
| 44 | } else { |
| 45 | d[i] = 2 * pktsize[i] * 1000 / (linespeed * 1024) |
| 46 | if (d[i] > dmax) dmax = d[i] |
| 47 | } |
| 48 | } |
| 49 | } |
| 50 | |
| 51 | ds_avail = dmax * (linespeed - allocated) |
| 52 | for (i = 1; i <= n; i++) { |
| 53 | lsm1[i] = 0 |
| 54 | rtm1[i] = 0 |
| 55 | lsm2[i] = linespeed * prio[i] / sum_prio |
| 56 | if ((avgrate[i] > 0) && (d[i] > 0)) { |
| 57 | if (!(delay[i] > 0)) { |
| 58 | ds = ds_avail * prio[i] / sum_rtprio |
| 59 | ds_avail -= ds |
| 60 | rtm1[i] = rtm2[i] + ds/d[i] |
| 61 | } |
| 62 | lsm1[i] = rtm1[i] |
| 63 | } |
| 64 | else { |
| 65 | d[i] = 0 |
| 66 | } |
| 67 | } |
| 68 | |
| 69 | # main qdisc |
| 70 | for (i = 1; i <= n; i++) { |
| 71 | printf "tc class add dev "device" parent 1:1 classid 1:"class[i]"0 hfsc" |
| 72 | if (rtm1[i] > 0) { |
| 73 | printf " rt m1 " int(rtm1[i]) "kbit d " int(d[i] * 1000) "us m2 " int(rtm2[i])"kbit" |
| 74 | } |
| 75 | printf " ls m1 " int(lsm1[i]) "kbit d " int(d[i] * 1000) "us m2 " int(lsm2[i]) "kbit" |
| 76 | print " ul rate " int(maxrate[i]) "kbit" |
| 77 | } |
| 78 | |
| 79 | # leaf qdisc |
| 80 | avpkt = 1200 |
| 81 | for (i = 1; i <= n; i++) { |
| 82 | printf "tc qdisc add dev "device" parent 1:"class[i]"0 handle "class[i]"00: " |
| 83 | |
| 84 | # RED parameters - also used to determine the queue length for sfq |
| 85 | # calculate min value. for links <= 256 kbit, we use 1500 bytes |
| 86 | # use 50 ms queue length as min threshold for faster links |
| 87 | # max threshold is fixed to 3*min |
| 88 | base_pkt=3000 |
| 89 | base_rate=256 |
| 90 | min_lat=50 |
| 91 | if (maxrate[i] <= base_rate) min = base_pkt |
| 92 | else min = int(maxrate[i] * 1024 / 8 * 0.05) |
| 93 | max = 3 * min |
| 94 | limit = (min + max) * 3 |
| 95 | |
| 96 | if (qdisc[i] != "") { |
| 97 | # user specified qdisc |
| 98 | print qdisc[i] " limit " limit |
| 99 | } else if (rtm1[i] > 0) { |
| 100 | # rt class - use sfq |
| 101 | print "sfq perturb 2 limit " limit |
| 102 | } else { |
| 103 | # non-rt class - use RED |
| 104 | |
| 105 | avpkt = pktsize[i] |
| 106 | # don't use avpkt values less than 500 bytes |
| 107 | if (avpkt < 500) avpkt = 500 |
| 108 | # if avpkt is too close to min, scale down avpkt to allow proper bursting |
| 109 | if (avpkt > min * 0.70) avpkt *= 0.70 |
| 110 | |
| 111 | |
| 112 | # according to http://www.cs.unc.edu/~jeffay/papers/IEEE-ToN-01.pdf a drop |
| 113 | # probability somewhere between 0.1 and 0.2 should be a good tradeoff |
| 114 | # between link utilization and response time (0.1: response; 0.2: utilization) |
| 115 | prob="0.12" |
| 116 | |
| 117 | rburst=int((2*min + max) / (3 * avpkt)) |
| 118 | if (rburst < 2) rburst = 2 |
| 119 | print "red min " min " max " max " burst " rburst " avpkt " avpkt " limit " limit " probability " prob " ecn" |
| 120 | } |
| 121 | } |
| 122 | |
| 123 | # filter rule |
| 124 | for (i = 1; i <= n; i++) { |
| 125 | print "tc filter add dev "device" parent 1: prio "class[i]" protocol ip handle "class[i]" fw flowid 1:"class[i] "0" |
| 126 | filterc=1 |
| 127 | if (filter[i] != "") { |
| 128 | print " tc filter add dev "device" parent "class[i]"00: handle "filterc"0 "filter[i] |
| 129 | filterc=filterc+1 |
| 130 | } |
| 131 | } |
| 132 | } |
| 133 | |
| 134 | |
