Congestion Control Modification

[George Neville-Neil]

Are you planning to put the source to this up on a repo (github) or send 
along patches?
It would be good to get a look at this new algorithm.

Thanks,
George


On 21 Apr 2015, at 5:30, Karlis Laivins wrote:

> Hi,
>
> Thank you very much for such a comprehensive description of how to 
> properly
> create a loadable Kernel module, this does the trick - I was able to 
> create
> the module successfully, load it into Kernel and set it as the 
> congestion
> control algorithm used via sysctl net.inet.tcp.cc.algorithm=new (new - 
> the
> name of my test module).
>
> Best Regards,
> Karlis
>
> On Tue, Apr 21, 2015 at 3:05 AM, grenville armitage 
> <garmitage at swin.edu.au>
> wrote:
>
>> Hi,
>>
>>
>> On 04/18/2015 16:59, Karlis Laivins wrote:
>>
>>> Hello,
>>>
>>> I have read an interesting publication about a proposed modification 
>>> of
>>> TCP
>>> Congestion Control algorithm that would allow to improve it (the CC) 
>>> by
>>> dynamic bandwidth estimation. The idea seems so interesting that I 
>>> would
>>> like to try to implement it by modifying the NewReno code.
>>>
>>> Do I understand correctly that to do the above stated, I would 
>>> create a
>>> copy of source file (in my case - cc_newreno.c) located in 
>>> /usr/src/sys/
>>> and rename it to, for example, cc_newreno_test.c and make changes to 
>>> it?
>>> How would I then compile it, and how would I create a 
>>> newreno_test.ko file
>>> that can be loaded into Kernel and tested?
>>>
>>> Thank you in advance for your answers!
>>>
>>
>> In case this helps shed some (probably incomplete) light, here are 
>> the
>> steps
>> I took late last year to make a modified version of NewReno:
>>
>> I start with copying the newreno module under 
>> sys/netinet/cc/cc_newreno.c
>> as a template. The new source file will be called newrenoVarBeta.c
>>
>> /usr/src/sys/netinet/cc % cp cc_newreno.c cc_newrenoVarBeta.c
>> /usr/src/sys/netinet/cc %
>>
>> Then create a modules definition based on 
>> /usr/src/sys/modules/cc/cc_cubic
>> (because there isn't one for newreno per se)
>>
>> /usr/src/sys/netinet/cc % cd /usr/src/sys/modules/cc
>> /usr/src/sys/modules/cc % mkdir cc_newrenoVarBeta
>> /usr/src/sys/modules/cc % cp cc_cubic/Makefile cc_newrenoVarBeta/
>> /usr/src/sys/modules/cc %
>>
>> Tweak the cc_newrenoVarBeta/Makefile to say:
>>
>> KMOD=   cc_newrenoVarBeta
>> SRCS=   cc_newrenoVarBeta.c
>>
>> Made my changes to cc_newrenoVarBeta.c (including changing the 
>> module's
>> name from 'newreno' to something else)
>>
>> Then built/installed the new module with:
>>
>> /usr/src/sys/netinet/cc % cd 
>> /usr/src/sys/modules/cc/cc_newrenoVarBeta
>> /usr/src/sys/modules/cc % make clean && make && make install
>>      [..build and install output..]
>> /usr/src/sys/modules/cc %
>>
>> All being well, cc_newrenoVarBeta.ko should now exist under 
>> /boot/kernel
>>
>> Then use 'kldload cc_newrenoVarBeta.ko' to load your new CC algorithm
>>
>> If all goes well, your new module will appear (with whatever name you 
>> gave
>> it) in the sysctl net.inet.tcp.cc.available list. Don't forget to 
>> actually
>> select your new module with sysctl net.inet.tcp.cc.algorithm when 
>> running
>> experiments.
>>
>> cheers,
>> gja
>>
>>
>>
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