Hi Charles, I downloaded your linux-dev git and checkout the 3.8.13-bone27-xenomai branch. Everything seems to work fine until I get this error:
dir: xenomai - ipipe reference: v3.8.13, kernel version: 3.8.13 ipipe-core-3.8.13-x86-3.patch ipipe-core-3.8.13-arm-2.patch ipipe-core-3.8.13-blackfin-2.patch ipipe-core-3.8.13-powerpc-2.patch fatal: can't open patch '/home/<userid>/Download/GIT/linux-xenomai/ignore/ipipe/ipipe-core-3.8.13-a rm-1.patch': No such file or directory I looked in the ignore/ipipe and I do not see this patch. Regards, John On 9/30/13 8:12 PM, "Charles Steinkuehler" <[email protected]> wrote: >AFAIK, preempt-rt on the 3.8 kernel is either brand new or still a work >in process. The running kernels I'm aware of use a patched version of >3.2, but I haven't been following along real close. > >In my tests with preempt-rt (many months ago), I was getting pretty >lousy worst-case latency numbers, so I switched to using Xenomai. Note >that the latest Xenomai from git (soon to be officially released) >supports the 3.8.13 kernel as used on the BeagleBone, and has a pre/post >patch set to make it easy to build the kernel. I've even got kernel >build scripts if you don't like doing everything from scratch: > >https://github.com/cdsteinkuehler/linux-dev/tree/3.8.13-bone27-xenomai > >Since I looked at preempt-rt, the OSADL folks have brought up a test >system with an AM3359 (not a BeagleBone, but the same SoC), and they are >seeing much better latency numbers than I was. Again, this is still a >3.2 kernel, not a 3.8. I'm not sure if the better numbers are due to a >different kernel config or improved drivers. Preempt-rt relies on the >Linux kernel code and drivers being written for high-performance SMP >processing and generally playing nice, while xenomai just preempts the >entire Linux kernel (including any mis-behaving drivers) so it works >well with ...um... "sub-optimal" vendor-supplied drivers, which are all >too common in the ARM space. :) > >Let us all know if you get a 3.8 kernel with preempt-rt running on a >'Bone (white or black). > >On 9/30/2013 8:44 PM, wittend wrote: >> I am interested in tightening up the performance of the BBB as well. I >> would like to hear about either your experience with this or that of >>anyone >> else who has tried it. >> >> Dave >> >> On Monday, September 30, 2013 2:32:07 PM UTC-5, jeshu wrote: >>> >>> Hello List, >>> >>> Previously I have implemented my applications with Real time kernel in >>>my >>> Beaglebone White using Robert Nelson's kernel. Now I am going to >>>change the >>> platform/board to BBB, I am unable to find any RT patched kernel. Can >>> anybody post me the links where I can find the PT patched 3.8. kernel ? >>> >>> Thanks, >>> Jeshwanth >>> Bangalore >>> >> > > >-- >Charles Steinkuehler >[email protected] > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
