Re: [LARTC] Latency in SFQ

From: Adi Nugroho <Adi@iNterNUX.co.id>
To: lartc@vger.kernel.org
Subject: Re: [LARTC] Latency in SFQ
Date: Tue, 18 Dec 2001 10:27:51 +0000	[thread overview]
Message-ID: <marc-lartc-100867094901626@msgid-missing> (raw)
In-Reply-To: <marc-lartc-100865895013266@msgid-missing>

On Tuesday 18 December 2001 16:03, bert hubert wrote:
>
> I think cbq.init is misconfiguring things.
>

Dear Sir,

As your suggestion, I have made all rule by hand.
Bellow are my script, one for cbq (tbf+sfq), and one for htb (+sfq)

But the latency was still so high (sometimes more than 20.000 ms if 
overloaded)

From statistic, the overlimit packet is high, but there is no dropped packet

Thank you for your help.

Regards,
Adi Nugroho

========Script for cbq (tbf+sfq)
========dev=eth1
DEVBWDT\x10Mbit
DEVWGHT=1Mbit
tc qdisc del dev eth1 root
tc qdisc add dev $dev root handle 1:0 cbq\
                bandwidth $DEVBWDT avpkt 1000 cell 8
tc class add dev $dev parent 1:0 classid 1:1 cbq \
                bandwidth $DEVBWDT rate $DEVBWDT weight $DEVWGHT \
                prio 8 allot 1514 cell 8 maxburst 20 avpkt 1000

#parent class
tc class add dev eth1 parent 1:1 classid 1:64 cbq \
        bandwidth 10Mbit rate 64Kbit weight 6.4Kbit prio 8\
        allot 1514 cell 8 maxburst 20 avpkt 1000 bounded
tc qdisc add dev eth1 parent 1:64 tbf \
                rate 64Kbit buffer 3000 limit 3000

#Child class #1
tc class add dev eth1 parent 1:64 classid 1:164 cbq \
        bandwidth 10Mbit rate 16Kbit weight 1.6Kbit prio 5 \
        allot 1514 cell 8 maxburst 20 avpkt 1000

tc qdisc add dev eth1 parent 1:164 sfq \
                perturb 5 quantum 4500

tc filter add dev eth1 parent 1:0 protocol ip \
                prio 100 u32 match ip dst 10.0.0.222 flowid 1:164

#Child class #2
tc class add dev eth1 parent 1:64 classid 1:264 cbq \
        bandwidth 10Mbit rate 16Kbit weight 1.6Kbit prio 5 \
        allot 1514 cell 8 maxburst 20 avpkt 1000

tc qdisc add dev eth1 parent 1:264 sfq \
                perturb 5 quantum 4500

tc filter add dev eth1 parent 1:0 protocol ip \
                prio 100 u32 match ip dst 10.0.0.73 flowid 1:264

#Child class #3
tc class add dev eth1 parent 1:64 classid 1:364 cbq \
        bandwidth 10Mbit rate 16Kbit weight 1.6Kbit prio 5 \
        allot 1514 cell 8 maxburst 20 avpkt 1000

tc qdisc add dev eth1 parent 1:364 sfq \
                perturb 5 quantum 4500

tc filter add dev eth1 parent 1:0 protocol ip \
                prio 100 u32 match ip dst 10.0.0.30 flowid 1:364

===========Script for htb (+sfq)
===========tc qdisc add dev eth1 root handle 1: htb

tc class add dev eth1 parent 1: classid 1:1 htb rate 64Kbit burst 15k

tc class add dev eth1 parent 1:1 classid 1:10 htb rate 16Kbit ceil 64Kbit 
burst 15k
tc class add dev eth1 parent 1:1 classid 1:20 htb rate 16Kbit ceil 64Kbit 
burst 15k
tc class add dev eth1 parent 1:1 classid 1:30 htb rate 16Kbit ceil 64Kbit 
burst 15k

tc qdisc add dev eth1 parent 1:10 handle 10: sfq perturb 10
tc qdisc add dev eth1 parent 1:20 handle 20: sfq perturb 10
tc qdisc add dev eth1 parent 1:30 handle 30: sfq perturb 10

u32="tc filter add dev eth1 protocol ip parent 1:0 prio 1 u32"

$u32 match ip dst 10.0.0.222 flowid 1:10
$u32 match ip dst 10.0.0.73 flowid 1:20
$u32 match ip dst 10.0.0.30 flowid 1:30

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