Date: Thu, 30 Apr 2015 16:04:38 +0300 From: Karlis Laivins <karlis.laivins@gmail.com> To: George Neville-Neil <gnn@neville-neil.com> Cc: grenville armitage <garmitage@swin.edu.au>, freebsd-net@freebsd.org Subject: Re: Congestion Control Modification Message-ID: <CAF4H_7=WZTmNUaS9x0DJh1YNRzFCJPbqJ_eFp12=z8snvTpn3g@mail.gmail.com> In-Reply-To: <F572540B-45C8-4EBF-9E18-7CA7E30CFD0C@neville-neil.com> References: <CAF4H_7mSGp_GZGaDBx8xq47FY1j85xLHq%2BZY1jMzprbzp%2Bg9zw@mail.gmail.com> <5535945F.90504@swin.edu.au> <CAF4H_7nOJP=Wy7LJSBi2PGupnMMvZu0xYeT2iYjhKDg-DPC6fw@mail.gmail.com> <F572540B-45C8-4EBF-9E18-7CA7E30CFD0C@neville-neil.com>
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Hello, If I will be able to implement the idea described in the publication correctly, I will share the source code. At the moment, though, I am still far away from the implementation, since I have yet to solve the issue of how to get the One Way Delay for the ACK message (the time it takes ACK to arrive from receiver of the ACK'ed data sender) correctly. Best Regards, Karlis On Thu, Apr 30, 2015 at 3:51 PM, George Neville-Neil <gnn@neville-neil.com> wrote: > 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@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 >>> >>> >>> >>> _______________________________________________ >>> freebsd-net@freebsd.org mailing list >>> http://lists.freebsd.org/mailman/listinfo/freebsd-net >>> To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" >>> >>> _______________________________________________ >> freebsd-net@freebsd.org mailing list >> http://lists.freebsd.org/mailman/listinfo/freebsd-net >> To unsubscribe, send any mail to "freebsd-net-unsubscribe@freebsd.org" >> >
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