Hi Tiago, On 06/28/2016 11:55 AM, Tiago Brito wrote: > Hi, so after comparing the binaries I realized that my NW application is > using hard float instruction, unlike it's SW counter part. > > I changed my NW application toolchain for one which support soft float in > order to check if my measurements are consistent. And in some way the > execution time gap between both for-loops decreased significantly, but > there's still a 100 ms gap between both execution times. > > Before the NW was measuring 155 ms and the SW was measuring 610 ms. Now the > NW is measuring 500 ms whilst the SW is measuring the same 610 ms as before. > > My theory is that Genode's scheduling might be delaying the SW execution. I > say this because I added a print in the resume function of the thread > scheduler and it prints several times when the SW for-loop is executing. > > What I want to ask is, is my theory plausible? Would the SW scheduler delay > the execution by 100 ms? It seems a bit too much time... > What can I do to shorten this time gap between both executions? >
By default, if you do not configure any CPU quota and priority, the kernel will schedule round-robin. As long as the "normal" world is not stopped during the calculation within your "secure" Genode component, it will be executed side-by-side. But I wonder why it is not stopped - did you changed the execution model? If you want to ensure that your specific calculation routine is always executed when it is runnable, you have to add a: <resource name="CPU" quantum="100"/> in its start node within the XML configuration of the init component. This will give 100% of the CPU quota to your component. But be aware that you can easily starve other components this way, as long as your component never blocks. Regards Stefan > Thanks in advance, Tiago > > 2016-06-27 12:16 GMT+01:00 Tiago Brito <tb.gen...@gmail.com>: > >> Hi again, I'm using the linaro's arm-linux-gnueabihf 5.3 toolchain to >> compile the application running on top of the NW linux, but I want to try >> and compile it using the same compiler version used for genode since the >> use of different compilers is probably interfering with my benchmark >> measurements (it's the only variant). >> >> I tried using the GCC present in genode's toolchain but I'm having several >> No such file or directory errors with stdio.h and string.h includes. My >> application also uses sockets, so the necessary include files are used and >> may cause similar errors in the compilation process. >> >> Do you have any suggestion on how to solve this and get the same basic >> for-loop to show similar performance results in both the Normal and Secure >> World execution contexts? >> >> Thanks, Tiago >> >> 2016-06-23 17:20 GMT+01:00 Christian Helmuth < >> christian.helm...@genode-labs.com>: >> >>> Hello Tiago, >>> >>> On Thu, Jun 23, 2016 at 04:32:18PM +0100, Tiago Brito wrote: >>>> I did not check if the binary code is similar, but I did measure just >>> the >>>> for-loop in both worlds and the times are those I described previously. >>> >>> You really should compare the binary code as example that's slower in >>> SW uses floating arithmetics unless I'm mistaken. If the code is >>> similar and the execution time differs much, there may be an issue >>> with FPU handling in SW. >>> >>> Greets >>> -- >>> Christian Helmuth >>> Genode Labs >>> >>> http://www.genode-labs.com/ · http://genode.org/ >>> https://twitter.com/GenodeLabs · /ˈdʒiː.nəʊd/ >>> >>> Genode Labs GmbH · Amtsgericht Dresden · HRB 28424 · Sitz Dresden >>> Geschäftsführer: Dr.-Ing. Norman Feske, Christian Helmuth >>> >>> >>> ------------------------------------------------------------------------------ >>> Attend Shape: An AT&T Tech Expo July 15-16. Meet us at AT&T Park in San >>> Francisco, CA to explore cutting-edge tech and listen to tech luminaries >>> present their vision of the future. This family event has something for >>> everyone, including kids. Get more information and register today. >>> http://sdm.link/attshape >>> _______________________________________________ >>> genode-main mailing list >>> genode-main@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/genode-main >>> >> >> > > > > ------------------------------------------------------------------------------ > Attend Shape: An AT&T Tech Expo July 15-16. Meet us at AT&T Park in San > Francisco, CA to explore cutting-edge tech and listen to tech luminaries > present their vision of the future. This family event has something for > everyone, including kids. Get more information and register today. > http://sdm.link/attshape > > > > _______________________________________________ > genode-main mailing list > genode-main@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/genode-main > -- Stefan Kalkowski Genode Labs http://www.genode-labs.com/ · http://genode.org/ ------------------------------------------------------------------------------ Attend Shape: An AT&T Tech Expo July 15-16. Meet us at AT&T Park in San Francisco, CA to explore cutting-edge tech and listen to tech luminaries present their vision of the future. This family event has something for everyone, including kids. Get more information and register today. http://sdm.link/attshape _______________________________________________ genode-main mailing list genode-main@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/genode-main
