LARTC - Oct 2000 - tc troubles

Hi all,
Its a while we are trying to use "tc" for bandwidth control. But each
time
we apply tc rules  to the network, we experience a lot of service
degradation. The usage we are mostly concerned about, is bandwidth control
of a group of IP addresses. We mark that subnet with IPChains and then apply
the tc rules. These are the rules applied to eth5 in order to limit the
uplink of packets marked "7" by ipchains:
# /sbin/tc class sh dev eth5
class cbq 40: root rate 100Mbit (bounded,isolated) prio no-transmit
class cbq 40:1 parent 40: rate 100Mbit prio no-transmit
class cbq 40:300 parent 40:1 leaf 8025: rate 200Kbit (bounded) prio 5
# /sbin/tc qdisc sh dev eth5
qdisc tbf 8025: rate 200Kbit burst 25Kb lat 1us
qdisc cbq 40: rate 100Mbit (bounded,isolated) prio no-transmit
[root@qos-1 naimi]# /sbin/tc filter sh dev eth5
filter parent 40: protocol ip pref 1 fw
filter parent 40: protocol ip pref 1 fw handle 0x7 classid 40:300
filter parent 40: protocol ip pref 80 u32
filter parent 40: protocol ip pref 80 u32 fh 800: ht divisor 1
filter parent 40: protocol ip pref 80 u32 fh 800::800 order 2048 key ht 800
bkt 0 flowid 40:100

As I mentioned, the service degraded severely: pig time of internet sites
increased about 300-500 ms!!
Does anybody know what is wrong with my configuration?

Best Regards
Hoomaan Naimi
Afranet Network Administrator

Dear Sir,
The question exactly arises from here:
How can I monitor the impact of these several settings on the network
performance?
How can I monitor the size of the queues, log the packets dropped ,....?
I would be thankful if you recommend me some tools or APIs for doing these
tasks.

Best Regards
Hoomaan Naimi
Afranet Network Administrator
----- Original Message -----
From: "bert hubert" <ahu@ds9a.nl>
To: "Hoomaan Naimi" <naimi@afranet.com>
Sent: Monday, October 23, 2000 1:59 PM
Subject: Re: [LARTC] tc troubles

> On Mon, Oct 23, 2000 at 01:45:22PM +0330, Hoomaan Naimi wrote:
> > Hi all,
> > Its a while we are trying to use "tc" for bandwidth control.
But each
time
> > we apply tc rules  to the network, we experience a lot of service
> > degradation. The usage we are mostly concerned about, is bandwidth
control
> > of a group of IP addresses. We mark that subnet with IPChains and then
apply
> > the tc rules. These are the rules applied to eth5 in order to limit
the
> > uplink of packets marked "7" by ipchains:
>
> Try reading the source of CBQ.init, which can set up rules for you. I miss
a
> lot of settings in your output, like weight, cell size etcetera. This
might
> lead to a bad configuration.
>
> Regards,
>
> bert hubert
>
> > # /sbin/tc class sh dev eth5
> > class cbq 40: root rate 100Mbit (bounded,isolated) prio no-transmit
> > class cbq 40:1 parent 40: rate 100Mbit prio no-transmit
> > class cbq 40:300 parent 40:1 leaf 8025: rate 200Kbit (bounded) prio 5
> > # /sbin/tc qdisc sh dev eth5
> > qdisc tbf 8025: rate 200Kbit burst 25Kb lat 1us
> > qdisc cbq 40: rate 100Mbit (bounded,isolated) prio no-transmit
> > [root@qos-1 naimi]# /sbin/tc filter sh dev eth5
> > filter parent 40: protocol ip pref 1 fw
> > filter parent 40: protocol ip pref 1 fw handle 0x7 classid 40:300
> > filter parent 40: protocol ip pref 80 u32
> > filter parent 40: protocol ip pref 80 u32 fh 800: ht divisor 1
> > filter parent 40: protocol ip pref 80 u32 fh 800::800 order 2048 key
ht
800
> > bkt 0 flowid 40:100
> >
> > As I mentioned, the service degraded severely: pig time of internet
sites
> > increased about 300-500 ms!!
> > Does anybody know what is wrong with my configuration?
> >
> > Best Regards
> > Hoomaan Naimi
> > Afranet Network Administrator
> >
> >
> >
> >
> > _______________________________________________
> > LARTC mailing list / LARTC@mailman.ds9a.nl
> > http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO:
http://ds9a.nl/2.4Routing/
> >
>
> --
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internet

Hello,

if the parameter you want to verify is bandwidth usage, I can recomend you a
Tcl/Tk application made for FreeBSD that also runs on Linux. It''s
called Tele
Traffic Taper and it is available in
http://www.csl.sony.co.jp/person/kjc/kjc/software.html. There, you can find the
code; it''s not difficult to install. You can also find an application
useful for
CBQ controls but the author has told me that some changes should be done in code
to make it ran on Linux (if somebody wants to try, it could be an interesting
tool
:-))))

Other apps like KSnuffle can also help you.

For other parameters, I can not help you :-((

See you !

Esteve Camps

Hoomaan Naimi wrote:
> Dear Sir,
> The question exactly arises from here:
> How can I monitor the impact of these several settings on the network
> performance?
> How can I monitor the size of the queues, log the packets dropped ,....?
> I would be thankful if you recommend me some tools or APIs for doing these
> tasks.