[LARTC] HFSC traffic loss bug, kernel 2.6.16.24

* [LARTC] HFSC traffic loss bug, kernel 2.6.16.24
@ 2006-09-10 15:28 Leo Wetz
  2006-09-13 16:38 ` Patrick McHardy
                   ` (2 more replies)
  0 siblings, 3 replies; 4+ messages in thread
From: Leo Wetz @ 2006-09-10 15:28 UTC (permalink / raw)
  To: lartc

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Hello,

I have finally managed to understand HFSC up to a level which allowed me to
create a QoS script which maintains low VoIP latency while running stuff
like eMule.

Unfortunately, HFSC seems to have a severe bug.
Why do I consider this as a bug defenitely?
Well, my script runs without any errors, then QoS works perfectly for some
hours, no error messages in kernel log.
Then randomly the kernel starts saying this:

Sep 10 17:14:51 router kernel: HFSC: Non-work-conserving qdisc ?
Sep 10 17:14:56 router kernel: printk: 266 messages suppressed.
Sep 10 17:14:56 router kernel: HFSC: Non-work-conserving qdisc ?
Sep 10 17:15:01 router kernel: printk: 259 messages suppressed.
Sep 10 17:15:01 router kernel: HFSC: Non-work-conserving qdisc ?
Sep 10 17:15:06 router kernel: printk: 294 messages suppressed.
Sep 10 17:15:06 router kernel: HFSC: Non-work-conserving qdisc ?

It floods the whole kernel log with this.
Traffic is also heavily affected by package loss when this happens, thus I
cannot ignore it.
I have to check my kernel log when I notice that I cannot access websites
anymore and then restart QoS manually.

My complete QoS script is attached to this mail.
If this is not the right location for the bug report please tell me whom I
should contact.

Thanks, Leo

[-- Attachment #2: qos --]
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#!/bin/sh

IF="dev ppp0"
IFUP=63kbps
P2PUP=50kbps

qROOT="1:0"
cMAIN="1:1"

cHTB="1:88"
cSKYPE="1:15"
cDEFAULT="1:20"

qHTB="10:0"
cP2P="10:10"
cEMULE="10:11"
cFTP="10:12"
cMIRANDA="10:13"
cAPACHE="10:14"

hSKYPE=115
hEMULE=111
hFTP=112
hMIRANDA=113
hAPACHE=114

MTU="1492"
q1="quantum 1492"
q2="quantum 2984"
q3="quantum 4476"
q5="quantum 7460"
addc="tc class add $IF parent"
addq="tc qdisc add $IF parent"
addf="tc filter add $IF parent"
fst="prio 1 protocol ip"

qos_enable()
{
	tc qdisc add $IF root handle $qROOT hfsc default 20

	$addc $qROOT classid $cMAIN 	hfsc ls rate $IFUP ul rate $IFUP
	$addc $cMAIN classid $cHTB		hfsc ls rate 20kbps ul rate $P2PUP
	$addc $cMAIN classid $cSKYPE	hfsc rt umax $MTU dmax 30ms rate 10kbps
	$addc $cMAIN classid $cDEFAULT	hfsc sc umax $MTU dmax 80ms rate 33kbps ul rate 42kbps

	$addq $cHTB handle $qHTB		htb r2q 4
	$addc $qHTB classid $cP2P		htb rate $P2PUP mtu $MTU
	$addc $cP2P classid $cEMULE		htb	rate 16kbps	ceil $P2PUP $q1 prio 4
	$addc $cP2P classid $cFTP		htb rate 10kbps	ceil $P2PUP $q1 prio 3
	$addc $cP2P classid $cMIRANDA	htb	rate 12kbps	ceil $P2PUP $q1 prio 2
	$addc $cP2P classid $cAPACHE	htb	rate 12kbps	ceil $P2PUP $q1 prio 1

	$addf $qROOT $fst handle $hSKYPE 	fw flowid $cSKYPE
	$addf $qROOT $fst handle $hEMULE 	fw flowid $cHTB
	$addf $qROOT $fst handle $hFTP 		fw flowid $cHTB
	$addf $qROOT $fst handle $hMIRANDA 	fw flowid $cHTB
	$addf $qROOT $fst handle $hAPACHE	fw flowid $cHTB

	$addf $qHTB $fst handle $hEMULE 	fw flowid $cEMULE
	$addf $qHTB $fst handle $hFTP 		fw flowid $cFTP
	$addf $qHTB $fst handle $hMIRANDA 	fw flowid $cMIRANDA
	$addf $qHTB $fst handle $hAPACHE	fw flowid $cAPACHE

	$addq $cEMULE	handle 101: sfq perturb 10  
	$addq $cFTP		handle 201: sfq perturb 10
	$addq $cMIRANDA handle 301: sfq perturb 10
	$addq $cAPACHE	handle 401: sfq perturb 10
	$addq $cSKYPE	handle 501: sfq perturb 10
	$addq $cDEFAULT	handle 601: sfq perturb 10
}

qos_disable()
{
	tc qdisc del $IF root
	sleep 1
}

qos_restart()
{
	qos_disable
	qos_enable
}

case "$1" in
    start)
    echo "Enabling QoS..."
    qos_enable
    ;;
    stop)
    echo "Disabling QoS..."
    qos_disable
    ;;
    restart)
    echo  "Restarting QoS... "
    qos_restart
    ;;
    *)
    echo "*** Usage: QoS {start|stop|restart}"
    ;;
esac

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