[Netkit.users] Netem on netkit

[Massimo Rimondini]

Dear Giovambattista,

done. this is now documented in the FAQs:
http://wiki.netkit.org/index.php/FAQ#It_seems_that_I_can.27t_get_iproute.2Febtables_tools_.28e.g..2C_tc.29_to_work._How_can_I_work_this_around.3F

Regards,
Massimo.


Giovambattista Ianni wrote:
> Thanks everybody for the suggestions! orig-tc works fine, and at the moment I 
> can go with this.
>
> perhaps it is worth mentioning this issue (orig-command vs commands in the 
> official distribution) somewhere: I wasn't aware of, nor I found info on the 
> public wiki.
>
> best, gb
>
> Massimo Rimondini ha scritto:
>   
>> Thank you Csaba for the contribution.
>>
>> Detailed instructions for the compilation can also be found in the 
>> kernel README file: http://wiki.netkit.org/download/netkit-kernel/README
>>
>> Regards,
>> Massimo.
>>
>>
>> Csaba Kiraly wrote:
>>     
>>> it is also quite easy to compile your own kernel for netkit. I don't 
>>> know whether it is in the faq or not, but basically what you need is to
>>> compile a kernel for the "um" architecture with the configiuration file 
>>> mentioned below.
>>>
>>> make "ARCH=um"
>>>
>>> don't forget  to add ARCH=um for all your make commands, even 
>>> configuration ones, otherwise you will mix up architectures.
>>>
>>> Then, you just have to redirect netkit links to the exexutable and to 
>>> the modules folder, and there you go!
>>>
>>> Csaba
>>>
>>>
>>> Massimo Rimondini wrote:
>>>   
>>>       
>>>> Dear Giovambattista,
>>>>
>>>> try using the same command but replacing the tc executable with "orig-tc".
>>>> Netem is actually compiled in the current Netkit kernel. You can check
>>>> it in the configuration file available online
>>>> (http://wiki.netkit.org/download/netkit-kernel/netkit-kernel-config-i386-K2.8)
>>>> or inside a virtual machine:
>>>>
>>>>   
>>>>     
>>>>         
>>>>> pc1:~# zgrep NETEM /proc/config.gz
>>>>> CONFIG_NET_SCH_NETEM=y
>>>>>     
>>>>>       
>>>>>           
>>>> However, there seem to be problems with some iproute commands that are
>>>> imported from the MPLS Linux project. That is why we also provide their
>>>> original releases from Debian packages, with their name prefixed by "orig-".
>>>>
>>>> Hope this helps.
>>>>
>>>> Regards,
>>>> Massimo.
>>>>
>>>>
>>>> Giovambattista Ianni wrote:
>>>>   
>>>>     
>>>>         
>>>>> Dear all,
>>>>>
>>>>> I had in mind to do some delay+packet loss simulation using netkit, so I started 
>>>>> issuing some netem command in virtual machines, like:
>>>>>
>>>>> tc qdisc add dev eth0 root netem delay 100ms
>>>>>
>>>>> but, what I get is:
>>>>>
>>>>> Unknown qdisc "netem", hence option "delay" is unparsable
>>>>>
>>>>> Apparently netem is not compiled in the netkit kernel: I'm using a freshly 
>>>>> downloaded netkit copy with a "2.6.26.5-netkit-K2.8 (max a brunello) (gcc version 
>>>>> 4.3.3 (Debian 4.3.3-13)" kernel on it.
>>>>>
>>>>> Massimo reports that netem should be available in netkit:
>>>>> http://list.dia.uniroma3.it/pipermail/netkit.users/2008-May/000353.html
>>>>>
>>>>> but there is something wrong: is netem actually in? is there a way to enable it?
>>>>> should I modprobe some additional module? has netem perhaps a different qdisc 
>>>>> name? (it was 'delay' in old kernels but this doesn't work)
>>>>>
>>>>> regards, gb
>>>>>
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>>>>>   
>>>>>     
>>>>>       
>>>>>           
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