I am in the process of upgrading from 32-bit/Xenomai 2.6.4/Ubuntu 14.04.4/ Linux 3.16.7 to 64-bit/Xenomai 3.1/Ubuntu 20.04.1/Linux 5.4.77 and I'm experiencing an rtserial event difference in behavior. Our application depends on single-byte interrupts from rtserial ports, which we're not seeing despite having configured rtserial ports the same between our 2 different image configurations that run on the same x86 hardware. Attached is a modified cross-link.c example that highlights this difference in behavior. Also included is relevant detail for each target, build, and sample program output.
My modified cross-link.c transmits 26 characters every 1 second and prints the number of RX_PEND events along with reception bins every 26 characters read by the receive thread. Reception bins show the number of bytes read per RX_PEND event [0-16,17+]. The total number of bytes processed equals the sum of all bins multiplied by the quantity they represent. For example, these snipped outputs (from the below greater details) were taken following a total of 208 bytes transmitted. In 2.6.4 we have 208 events * 1 byte = 208 bytes and in 3.1 we have 48 events * 4 bytes + 8 events * 2 bytes = 208 bytes. We expect/desire the second bin to be exclusively non-zero (2.6.4 output), indicating an RX_PEND event for each byte that arrives on the serial port. 2.6.4 Output: rx.events=1 | rx.rx_pending=1 | r_t=1618404168709819446 Count= 208 bins=0 208 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3.1 Output: rx.events=1 | rx.rx_pending=2 | r_t=1618406767806828954 Count= 56 bins=0 0 8 0 48 0 0 0 0 0 0 0 0 0 0 0 0 0 I'm not sure where to take the next level of troubleshooting and am happy to provide additional detail, run tests, etc. The attached cross-link includes some preprocessor defines to modify program behaviors that I can explain if helpful. Details shown below are also attached with line wrapping removed for reference. Thanks! Alan ::32-bit System Details:: -BOOT_IMAGE=/boot/vmlinuz-3.16.7 root=UUID=1bfa0993-a88b-4a77-be72-0f1531acf3fa ro quiet splash 8250.nr_uarts=4 xeno_hal.smi=-1 consoleblank=0 vt.handoff=7 -Xenomai retrieved from https://www.xenomai.org/downloads/xenomai/stable/xenomai-2.6.4.tar.bz2 -config.log first 14 lines : It was created by Xenomai configure 2.6.4, which was generated by GNU Autoconf 2.69. Invocation command line was $ ../configure --prefix=/home/delta/kernel/xenomai-libs --enable-x86-sep CFLAGS=-O3 ## --------- ## ## Platform. ## ## --------- ## hostname = delta uname -m = i686 uname -r = 3.16.7 uname -s = Linux uname -v = #1 SMP Sun Jul 26 11:10:00 EDT 2015 -Ipipe patch retrieved from https://www.xenomai.org/downloads/ipipe/v3.x/x86/older/ipipe-core-3.16.7-x85-5.patch ::32-bit Example Build:: gcc -o cross-link cross-link.c -I/home/jbw/GitWorkTree/master/Development/Cobalt/include -D_GNU_SOURCE -D_REENTRANT -D__XENO__ -I/home/jbw/GitWorkTree/master/Development/Cobalt/include -D_GNU_SOURCE -D_REENTRANT -D__XENO__ -lrtdm -L/home/jbw/GitWorkTree/master/Development/Cobalt/lib -lxenomai -lpthread -lrt -lnative -L/home/jbw/GitWorkTree/master/Development/Cobalt/lib -lxenomai -lpthread -lrt ::32-bit Example Execution:: main : write-file opened main : write-config written main : read-file opened main : read-config written main : read-config gotten main : write-task created main : read-task created main : starting write-task main : starting read-task Built for Xenomai 2.6.4 Write task sends 26 chars every 1.00 s Printing on message size modulus of 26 Baud Rate = 115200 fifo_depth written = 0, fifo_depth received = 0 rx timeout written = 4294967295, rx timeout received = 4294967295 event timeout written = 0, event timeout received = 0 rx.events=1 | rx.rx_pending=1 | r_t=1618404161709825071 Count= 26 bins=0 26 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 rx.events=1 | rx.rx_pending=1 | r_t=1618404162709820540 Count= 52 bins=0 52 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 rx.events=1 | rx.rx_pending=1 | r_t=1618404163709821237 Count= 78 bins=0 78 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 rx.events=1 | rx.rx_pending=1 | r_t=1618404164709821910 Count= 104 bins=0 104 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 rx.events=1 | rx.rx_pending=1 | r_t=1618404165709817391 Count= 130 bins=0 130 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 rx.events=1 | rx.rx_pending=1 | r_t=1618404166709818064 Count= 156 bins=0 156 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 rx.events=1 | rx.rx_pending=1 | r_t=1618404167709818773 Count= 182 bins=0 182 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 rx.events=1 | rx.rx_pending=1 | r_t=1618404168709819446 Count= 208 bins=0 208 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ::64-bit Target Details:: Xenomai version: Xenomai/cobalt v3.1 -- #932fc81c4 (2021-03-06 09:12:44 +0100) Linux delta 5.4.77-Cobalt-v6 #1 SMP PREEMPT Wed Apr 7 16:51:16 EDT 2021 x86_64 x86_64 x86_64 GNU/Linux Kernel parameters: BOOT_IMAGE=/boot/vmlinuz-5.4.77-Cobalt-v6 root=UUID=147f0e74-99ca-4816-9e22-4c3f4f5e8c66 ro isolcpus=1 xenomai.supported_cpus=0x01 splash quiet 8250.nr_uarts=4 xenomai.smi=enabled fsck.mode=force vt.handoff=7 I-pipe release #2 detected (retrieved from: https://www.xenomai.org/downloads/ipipe/v5.x/x86/ipipe-core-5.4.77-x86-2.patch) Cobalt core 3.1 detected Compiler: gcc version 9.3.0 (Ubuntu 9.3.0-10ubuntu2) Build args: --prefix=/home/delta/kernel/xenomai-libs --with-core=cobalt --enable-smp --enable-pshared --enable-debug=symbols ::64-bit Build:: gcc -o cross-link cross-link.c -I/home/jbw/GitWorkTree/sandbox/Development/Cobalt/include/cobalt -I/home/jbw/GitWorkTree/sandbox/Development/Cobalt/include -D_GNU_SOURCE -D_REENTRANT -fasynchronous-unwind-tables -D__COBALT__ -I/home/jbw/GitWorkTree/sandbox/Development/Cobalt/include/alchemy -D__COBALT_WRAP__ -Wl,--no-as-needed -Wl,@/home/jbw/GitWorkTree/sandbox/Development/Cobalt/lib/cobalt.wrappers -Wl,@/home/jbw/GitWorkTree/sandbox/Development/Cobalt/lib/modechk.wrappers -lalchemy -lcopperplate /home/jbw/GitWorkTree/sandbox/Development/Cobalt/lib/xenomai/bootstrap.o -Wl,--wrap=main -Wl,--dynamic-list=/home/jbw/GitWorkTree/sandbox/Development/Cobalt/lib/dynlist.ld -L/home/jbw/GitWorkTree/sandbox/Development/Cobalt/lib -lcobalt -lmodechk -lpthread -lrt ::64-bit Execution:: main : write-file opened main : write-config written main : read-file opened main : read-config written main : read-config gotten main : write-task created main : read-task created main : starting write-task main : starting read-task Built for Xenomai 3.1 Write task sends 26 chars every 1.00 s Printing on message size modulus of 26 Baud Rate = 115200 fifo_depth written = 0, fifo_depth received = 0 rx timeout written = 18446744073709551615, rx timeout received = 18446744073709551615 event timeout written = 0, event timeout received = 0 rx.events=1 | rx.rx_pending=2 | r_t=1618406760806831175 Count= 7 bins=0 0 1 0 6 0 0 0 0 0 0 0 0 0 0 0 0 0 rx.events=1 | rx.rx_pending=2 | r_t=1618406761806831122 Count= 14 bins=0 0 2 0 12 0 0 0 0 0 0 0 0 0 0 0 0 0 rx.events=1 | rx.rx_pending=2 | r_t=1618406762806833636 Count= 21 bins=0 0 3 0 18 0 0 0 0 0 0 0 0 0 0 0 0 0 rx.events=1 | rx.rx_pending=2 | r_t=1618406763806825651 Count= 28 bins=0 0 4 0 24 0 0 0 0 0 0 0 0 0 0 0 0 0 rx.events=1 | rx.rx_pending=2 | r_t=1618406764806828562 Count= 35 bins=0 0 5 0 30 0 0 0 0 0 0 0 0 0 0 0 0 0 rx.events=1 | rx.rx_pending=2 | r_t=1618406765806828508 Count= 42 bins=0 0 6 0 36 0 0 0 0 0 0 0 0 0 0 0 0 0 rx.events=1 | rx.rx_pending=2 | r_t=1618406766806829031 Count= 49 bins=0 0 7 0 42 0 0 0 0 0 0 0 0 0 0 0 0 0 rx.events=1 | rx.rx_pending=2 | r_t=1618406767806828954 Count= 56 bins=0 0 8 0 48 0 0 0 0 0 0 0 0 0 0 0 0 0 PRIVACY NOTICE: The information contained in this e-mail, including any attachments, is confidential and intended only for the named recipient(s). 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