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[openwrt.git] / package / qos-scripts / files / usr / lib / qos / tcrules.awk

diff --git a/package/qos-scripts/files/usr/lib/qos/tcrules.awk b/package/qos-scripts/files/usr/lib/qos/tcrules.awk
index 8220d99..7bef85b 100644 (file)
--- a/package/qos-scripts/files/usr/lib/qos/tcrules.awk
+++ b/package/qos-scripts/files/usr/lib/qos/tcrules.awk
@@ -77,19 +77,41 @@ END {
        # leaf qdisc
        avpkt = 1200
        for (i = 1; i <= n; i++) {
        # 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: "
                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
                if (rtm1[i] > 0) {
                        # rt class - use sfq

-                       print "sfq perturb 2 limit " ql
+                       print "sfq perturb 2 limit "  limit

                } else {
                } 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((1.5*min + max) / (3 * avpkt))
-                       print "red min " min " max " max " burst " rburst " avpkt " avpkt " limit " dqb " probability 0.04 ecn"
+                       # 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 " limit " probability " prob " ecn"

                }
        }
        
                }
        }