[LARTC] Qos Slowing down

[LARTC] Qos Slowing down

[Thomas Switala]

Hi

I have a bandwidth manager configured on the following system:

                    RedHat 8.0
                    Kernel  - 2.4.20 (Recompiled and I changed the
SFQ_DEPTH to 512
                                                and the  SFQ_HASH 3072
                                                and the PSCHED_CLOCK_SOURCE
= PSCHED_CPU

                    Patches for the kernel  = ebtables
                    glibc-2.3.2-4.80.6

The  system is build to act as a bridge. Qos happens on the outgoing eth0
device to about
175 differant subnets. I am using HTB and I have the following hierachy


                                                Group1
                                                    |
                -----------------------------------------
                |
|
            SP1                                                        SP2
                |
|
-------------                                              -------------
 |      |     |    |                                               |     |
|     |
cl1 cl2 cl3 cl4                                            cl5 cl6  cl7  cl8


Al of the cl belong to a service provider (sp) where they are on shared
bandwidth
all of them have a CIR of 1 and a Ceil of 384kbps.


The problem that I am experiencing , and it happens often lately is that the
Qos slows down and
it doesn't pass any traffic at all. I have to restart the whole system
before it starts working again.
If I stop the tc on the device it works as well which rules out the
bridging.

What could be wrong and is Linux going to handle more than 800 sites on a
40Mbps connection ?


--
Warm Regards
Thomas I. Switala
CEO and Lead Systems Architect Genotribe Ltd

--
Cell :    +27-82-822-5080       (South-Africa)
            +234-803-794-8252   (Nigeria)
IM:       genotribe@jabber.genotribe.com   (Jabber)
            genotribe                                        (Yahoo)


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Re: [LARTC] Qos Slowing down

[Stef Coene]

On Wednesday 19 November 2003 09:02, Thomas Switala wrote:
> Hi
>
> I have a bandwidth manager configured on the following system:
>
>                     RedHat 8.0
>                     Kernel  - 2.4.20 (Recompiled and I changed the
> SFQ_DEPTH to 512
>                                                 and the  SFQ_HASH 3072
>                                                 and the PSCHED_CLOCK_SOURCE
> = PSCHED_CPU
>
>                     Patches for the kernel  = ebtables
>                     glibc-2.3.2-4.80.6
>
> The  system is build to act as a bridge. Qos happens on the outgoing eth0
> device to about
> 175 differant subnets. I am using HTB and I have the following hierachy
>
>
>                                                 Group1
>
>                 -----------------------------------------
>
>
>             SP1                                                        SP2
>
>
> -------------                                              -------------
>
>
> cl1 cl2 cl3 cl4                                            cl5 cl6  cl7 
> cl8
>
>
> Al of the cl belong to a service provider (sp) where they are on shared
> bandwidth
> all of them have a CIR of 1 and a Ceil of 384kbps.
>
>
> The problem that I am experiencing , and it happens often lately is that
> the Qos slows down and
> it doesn't pass any traffic at all. I have to restart the whole system
> before it starts working again.
> If I stop the tc on the device it works as well which rules out the
> bridging.
>
> What could be wrong and is Linux going to handle more than 800 sites on a
> 40Mbps connection ?
Do you see any information in the kernel log?  And what shows dmesg?  Maybe a 
spu or memory bottleneck?

Stef

-- 
stef.coene@docum.org
 "Using Linux as bandwidth manager"
     http://www.docum.org/
     #lartc @ irc.openprojects.net

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