Re: [LARTC] How many (htb) tc classes and qdiscs are too many?

From: Konrad <kcem@tlen.pl>
To: lartc@vger.kernel.org
Subject: Re: [LARTC] How many (htb) tc classes and qdiscs are too many?
Date: Fri, 03 Jun 2005 10:43:19 +0000	[thread overview]
Message-ID: <42A03447.30306@tlen.pl> (raw)
In-Reply-To: <000501c567bf$792fd700$650fa8c0@hotsitespencer>

Szymon Miotk wrote:

> I have P4 3.0 GHz, 1 GB RAM.
> I have 3500 potential users (top load about 800 users, average 400). I 
> have 3 interfaces (2 WAN + 1 LAN), so I have 10500 queues total (3500 on 
> each interface).
> The traffic is 24Mbit max, average 20Mbit.

OK... What's wrong?

I can only use 4775 filters :/

This is a reslts of my small script...

loops: 674 filters: 4718 classes: 2022
loops: 675 filters: 4725 classes: 2025
loops: 676 filters: 4732 classes: 2028
loops: 677 filters: 4739 classes: 2031
loops: 678 filters: 4746 classes: 2034
loops: 679 filters: 4753 classes: 2037
loops: 680 filters: 4760 classes: 2040
loops: 681 filters: 4767 classes: 2043
loops: 682 filters: 4774 classes: 2046
RTNETLINK answers: File exists
We have an error talking to the kernel
RTNETLINK answers: File exists
We have an error talking to the kernel
RTNETLINK answers: File exists
We have an error talking to the kernel
RTNETLINK answers: File exists
We have an error talking to the kernel
RTNETLINK answers: File exists
We have an error talking to the kernel
RTNETLINK answers: File exists
We have an error talking to the kernel
loops: 683 filters: 4781 classes: 2049
RTNETLINK answers: File exists
We have an error talking to the kernel
RTNETLINK answers: File exists
We have an error talking to the kernel
RTNETLINK answers: File exists
We have an error talking to the kernel
RTNETLINK answers: File exists
We have an error talking to the kernel
RTNETLINK answers: File exists
We have an error talking to the kernel
RTNETLINK answers: File exists
We have an error talking to the kernel
RTNETLINK answers: File exists
We have an error talking to the kernel
loops: 684 filters: 4788 classes: 2052

What's wrong?
I need more filters :/

I have 2.6.11.11 kernel with new iproute2, u32 match mark support and 
IMQ (AB)...

Everyone can make theoretically 0xffff (65535) classes and qdiscs on one 
device. And I think this is true, but I can't add more filters then 4775! :(

---
v=1; cnt=0;
tc qdisc add dev imq0 root handle 1:0 htb

while : [ $v -le 11000 ]; do
qu0=`printf "%x\n" $v`

qu1=`printf "%x\n" $v`
qu2=`printf "%x\n" $((v+1))`
qu3=`printf "%x\n" $((v+2))`

tc class add dev imq0 parent 1:0 classid 1:$qu1 htb rate 1000Mbit ceil 
1000Mbit quantum 1500
tc class add dev imq0 parent 1:$qu1 classid 1:$qu2 htb rate 1kbit ceil 
1kbit prio 1 quantum 1500
tc class add dev imq0 parent 1:$qu1 classid 1:$qu3 htb rate 1kbit ceil 
1kbit prio 2 quantum 1500

tc qdisc add dev imq0 parent 1:$qu2 sfq
tc qdisc add dev imq0 parent 1:$qu3 sfq

tc filter add dev imq0 protocol ip parent 1:$qu0 pref 5 u32 match ip dst 
192.168.0.5 flowid 1:$qu1

tc filter add dev imq0 protocol ip parent 1:$qu1 pref 6 u32 match ip 
protocol 6 0xff match ip sport 80 0xffff flowid 1:$qu2
tc filter add dev imq0 protocol ip parent 1:$qu1 pref 6 u32 match ip 
protocol 6 0xff match ip dport 80 0xffff flowid 1:$qu2

tc filter add dev imq0 protocol ip parent 1:$qu1 pref 6 u32 match ip 
protocol 17 0xff match ip sport 53 0xffff flowid 1:$qu2
tc filter add dev imq0 protocol ip parent 1:$qu1 pref 6 u32 match ip 
protocol 17 0xff match ip dport 53 0xffff flowid 1:$qu2

tc filter add dev imq0 protocol ip parent 1:$qu1 pref 6 u32 match ip 
protocol 1 0xff flowid 1:$qu2
tc filter add dev imq0 protocol ip parent 1:$qu1 pref 7 u32 match ip dst 
192.168.0.5 flowid 1:$qu3

let "v=v+3"
let "cnt=cnt+1"
echo "loops: $cnt filters: $((cnt*7)) classes: $((cnt*3))"
done
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