diff options
Diffstat (limited to 'package/qos-scripts/files/usr/lib/qos/tcrules.awk')
| -rw-r--r-- | package/qos-scripts/files/usr/lib/qos/tcrules.awk | 39 |
1 files changed, 30 insertions, 9 deletions
diff --git a/package/qos-scripts/files/usr/lib/qos/tcrules.awk b/package/qos-scripts/files/usr/lib/qos/tcrules.awk index d236b2df93..7bef85b0d0 100644 --- a/package/qos-scripts/files/usr/lib/qos/tcrules.awk +++ b/package/qos-scripts/files/usr/lib/qos/tcrules.awk @@ -77,20 +77,41 @@ END { # leaf qdisc avpkt = 1200 for (i = 1; i <= n; i++) { - ql = int((avgrate[i] + linespeed) * 1024 / (8 * pktsize[i])) printf "tc qdisc add dev "device" parent 1:"class[i]"0 handle "class[i]"00: " + + # RED parameters - also used to determine the queue length for sfq + # calculate min value. for links <= 256 kbit, we use 1500 bytes + # use 50 ms queue length as min threshold for faster links + # max threshold is fixed to 3*min + base_pkt=3000 + base_rate=256 + min_lat=50 + if (maxrate[i] <= base_rate) min = base_pkt + else min = int(maxrate[i] * 1024 / 8 * 0.05) + max = 3 * min + limit = (min + max) * 3 + if (rtm1[i] > 0) { # rt class - use sfq - print "sfq perturb 2 limit " ql + print "sfq perturb 2 limit " limit } else { - # non-rt class - use red - min = int(maxrate[i] * 1024 / 8 * 0.05) - if (min < avpkt) min = avpkt - dqb = 8 * min; - max = int(2.1*min) - rburst = int((2*min + max) / (3 * avpkt)) + # non-rt class - use RED + + avpkt = pktsize[i] + # don't use avpkt values less than 500 bytes + if (avpkt < 500) avpkt = 500 + # if avpkt is too close to min, scale down avpkt to allow proper bursting + if (avpkt > min * 0.70) avpkt *= 0.70 + + + # according to http://www.cs.unc.edu/~jeffay/papers/IEEE-ToN-01.pdf a drop + # probability somewhere between 0.1 and 0.2 should be a good tradeoff + # between link utilization and response time (0.1: response; 0.2: utilization) + prob="0.12" + + rburst=int((2*min + max) / (3 * avpkt)) if (rburst < 2) rburst = 2 - print "red min " min " max " max " burst " rburst " avpkt " avpkt " limit " dqb " probability 0.04 ecn" + print "red min " min " max " max " burst " rburst " avpkt " avpkt " limit " limit " probability " prob " ecn" } } |