Am 14.09.2012 um 03:36 schrieb Charles Steinkuehler: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > On 9/13/2012 2:13 PM, Michael Haberler wrote: >> in addition to the rt-preempt measurements reported before, I built >> a xenomai 'GPIO wiggler' in C, using the (actually working) xenomi >> hires timers, and ran it on an idle rpi, and then a few times >> under some load (2 compiles). >> >> I collated everything here: >> http://linuxcnc.mah.priv.at/rpi/rpi-rtperf.html > > How did you get your PREEMPT-RT kernel for the pi? I haven't > successfully built one yet, but I've been traveling and had limited > chance to test.
Charles, that was the kernel which is currently recommend by Raspbian the config is here: http://git.mah.priv.at/gitweb/raspberry-test.git/blob/a5e40ad89a3387f3e336776a4ebb299b21ada35e:/proc_config_gz.txt I rebuilt it though just to see what knobs can be twisted, see below -m ps: my scribblings on the side during cross-building: -------------------------------- http://elinux.org/RPi_Kernel_Compilation firmware: first time: ----------- cd rpi/kernel-build git clone git://github.com/raspberrypi/firmware.git cd firmware/boot scp arm128_start.elf arm192_start.elf arm224_start.elf bootcode.bin loader.bin start.elf <user>@<host>:/boot/ next time: ---------- cd rpi/kernel-build/firmware git pull cd boot scp arm128_start.elf arm192_start.elf arm224_start.elf bootcode.bin loader.bin start.elf <user>@<host>:/boot/ see http://raspberrypi.stackexchange.com/questions/1/how-do-i-build-a-gcc-4-7-toolchain-for-cross-compiling I used this ready built toolchain though: checkout toolchain from here: git clone https://github.com/raspberrypi/tools.git --depth 1 set TCPREFIX below as per location kernel build ------------ cd rpi/kernel-build mkdir raspberrypi cd raspberrypi git clone git://github.com/raspberrypi/linux.git cd linux cp arch/arm/configs/bcmrpi_cutdown_defconfig .config export TCPREFIX=/home/mah/rpi/kernel-build/tools/arm-bcm2708/arm-bcm2708hardfp-linux-gnueabi/bin/arm-bcm2708hardfp-linux-gnueabi- make ARCH=arm CROSS_COMPILE=$TCPREFIX oldconfig #optional#make ARCH=arm CROSS_COMPILE=$TCPREFIX menuconfig make ARCH=arm CROSS_COMPILE=$TCPREFIX -k -j 6 return after lunch;) > - -- > Charles Steinkuehler > char...@steinkuehler.net > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.11 (MingW32) > Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ > > iEYEARECAAYFAlBSiioACgkQLywbqEHdNFzqVgCg7dajAro3DHPImYpEselKxxJ4 > RbUAn1jCqNjrmTW0JzhsIuOt8URPYP4Q > =N6hC > -----END PGP SIGNATURE----- ------------------------------------------------------------------------------ Got visibility? Most devs has no idea what their production app looks like. Find out how fast your code is with AppDynamics Lite. http://ad.doubleclick.net/clk;262219671;13503038;y? http://info.appdynamics.com/FreeJavaPerformanceDownload.html _______________________________________________ Emc-developers mailing list Emc-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-developers
