From d5fc598d62e09bbe51c24c3823d512b80d662bca Mon Sep 17 00:00:00 2001
From: Felix Fietkau <nbd@openwrt.org>
Date: Wed, 16 May 2012 15:23:16 +0000
Subject: qos-scripts: replace sfq/red with fq_codel - massively improves
latency under load
SVN-Revision: 31759
---
package/qos-scripts/files/usr/lib/qos/generate.sh | 3 +-
package/qos-scripts/files/usr/lib/qos/tcrules.awk | 42 ++---------------------
2 files changed, 3 insertions(+), 42 deletions(-)
(limited to 'package/qos-scripts/files/usr/lib')
diff --git a/package/qos-scripts/files/usr/lib/qos/generate.sh b/package/qos-scripts/files/usr/lib/qos/generate.sh
index 07b9559fdd..bb1d7ed111 100755
--- a/package/qos-scripts/files/usr/lib/qos/generate.sh
+++ b/package/qos-scripts/files/usr/lib/qos/generate.sh
@@ -344,8 +344,7 @@ tc filter add dev $device parent ffff: protocol ip prio 1 u32 match u32 0 0 flow
fi
add_insmod cls_fw
add_insmod sch_hfsc
- add_insmod sch_sfq
- add_insmod sch_red
+ add_insmod sch_fq_codel
cat <<EOF
${INSMOD:+$INSMOD$N}${dev_up:+$dev_up
diff --git a/package/qos-scripts/files/usr/lib/qos/tcrules.awk b/package/qos-scripts/files/usr/lib/qos/tcrules.awk
index 0021eaa7ce..a19b651920 100644
--- a/package/qos-scripts/files/usr/lib/qos/tcrules.awk
+++ b/package/qos-scripts/files/usr/lib/qos/tcrules.awk
@@ -79,47 +79,9 @@ END {
# leaf qdisc
avpkt = 1200
for (i = 1; i <= n; 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 (qdisc[i] != "") {
- # user specified qdisc
- print qdisc[i] " limit " limit
- } else if (rtm1[i] > 0) {
- # rt class - use sfq
- print "sfq perturb 2 limit " limit
- } else {
- # 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"
- }
+ print "tc qdisc add dev "device" parent 1:"class[i]"0 handle "class[i]"00: fq_codel"
}
-
+
# filter rule
for (i = 1; i <= n; i++) {
print "tc filter add dev "device" parent 1: prio "class[i]" protocol ip handle "class[i]"/0xff fw flowid 1:"class[i] "0"
--
cgit v1.2.3