CPU consumption on Raspberry Pi 3 over 100% in 9600 bauds.

[kovalroma]

Raspberry Pi 3
Direwolf 1.6

Command to start
rtl_fm -f 432.500M -g 22 -o 4 -s 44100 - | direwolf -c sdr.conf -r 44100 -B 9600 -

After first packet received, CPU increases over 100%. Then program stucks and not working.
On 1200 bauds working good.

[wb2osz]

I can't explain that. This is what I get, with the same command, on an RPi 3:

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
12674 pi 20 0 134912 12628 9424 S 43.7 1.3 61:03.90 direwolf
12673 pi 20 0 53232 6820 1824 S 11.6 0.7 15:24.04 rtl_fm

What are we doing differently?
What compiler are you using? gcc or clang?
When cmake is run, does it say somethng about NEON?

[kovalroma]

This command I use to install Direwolf

git clone https://www.github.com/wb2osz/direwolf
cd direwolf
mkdir build && cd build
cmake ..
make -j4
sudo make install

cmake log:

pi@raspberrypi:~/direwolf/build $ cmake ..
-- The C compiler identification is GNU 10.2.0
-- The CXX compiler identification is GNU 10.2.0
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Check for working C compiler: /usr/bin/cc - skipped
-- Detecting C compile features
-- Detecting C compile features - done
-- Detecting CXX compiler ABI info
-- Detecting CXX compiler ABI info - done
-- Check for working CXX compiler: /usr/bin/c++ - skipped
-- Detecting CXX compile features
-- Detecting CXX compile features - done
-- Found Git: /usr/bin/git (found version "2.28.0") 
-- Dire Wolf Version: 1.6.0
-- Build type set to: Release
CMake system: Linux
-- Target architecture: ARM
-- Use NEON SIMD instructions
-- Looking for pthread.h
-- Looking for pthread.h - found
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD
-- Performing Test CMAKE_HAVE_LIBC_PTHREAD - Failed
-- Check if compiler accepts -pthread
-- Check if compiler accepts -pthread - yes
-- Found Threads: TRUE  
-- Checking for module 'libgps'
--   No package 'libgps' found
-- Checking for module 'hamlib'
--   No package 'hamlib' found
CMake Warning (dev) at /usr/local/share/cmake-3.18/Modules/FindPackageHandleStandardArgs.cmake:273 (message):
  The package name passed to `find_package_handle_standard_args` (HAMLIB)
  does not match the name of the calling package (hamlib).  This can lead to
  problems in calling code that expects `find_package` result variables
  (e.g., `_FOUND`) to follow a certain pattern.
Call Stack (most recent call first):
  cmake/modules/Findhamlib.cmake:55 (find_package_handle_standard_args)
  CMakeLists.txt:260 (find_package)
This warning is for project developers.  Use -Wno-dev to suppress it.

-- Could NOT find HAMLIB (missing: HAMLIB_LIBRARY HAMLIB_INCLUDE_DIR) 
-- Found ALSA: /usr/lib/arm-linux-gnueabihf/libasound.so (found version "1.2.3.2") 
-- Checking for module 'libudev'
--   No package 'libudev' found
CMake Warning (dev) at /usr/local/share/cmake-3.18/Modules/FindPackageHandleStandardArgs.cmake:273 (message):
  The package name passed to `find_package_handle_standard_args` (UDEV) does
  not match the name of the calling package (udev).  This can lead to
  problems in calling code that expects `find_package` result variables
  (e.g., `_FOUND`) to follow a certain pattern.
Call Stack (most recent call first):
  cmake/modules/Findudev.cmake:68 (find_package_handle_standard_args)
  CMakeLists.txt:274 (find_package)
This warning is for project developers.  Use -Wno-dev to suppress it.

-- Could NOT find UDEV (missing: UDEV_LIBRARY UDEV_INCLUDE_DIR) 
-- Configuring done
-- Generating done
-- Build files have been written to: /home/pi/direwolf/build

make -j4 log:

pi@raspberrypi:~/direwolf/build $ make -j4
Scanning dependencies of target geotranz
Scanning dependencies of target misc
[  1%] Building C object external/misc/CMakeFiles/misc.dir/strlcpy.c.o
[  1%] Building C object external/misc/CMakeFiles/misc.dir/strlcat.c.o
[  1%] Building C object external/geotranz/CMakeFiles/geotranz.dir/mgrs.c.o
[  2%] Building C object external/geotranz/CMakeFiles/geotranz.dir/error_string.c.o
[  3%] Building C object external/geotranz/CMakeFiles/geotranz.dir/polarst.c.o
[  3%] Linking C static library libmisc.a
[  3%] Building C object external/geotranz/CMakeFiles/geotranz.dir/tranmerc.c.o
[  3%] Built target misc
[  4%] Building C object external/geotranz/CMakeFiles/geotranz.dir/ups.c.o
[  4%] Building C object external/geotranz/CMakeFiles/geotranz.dir/usng.c.o
[  5%] Building C object external/geotranz/CMakeFiles/geotranz.dir/utm.c.o
Scanning dependencies of target decode_aprs
Scanning dependencies of target text2tt
[  6%] Building C object src/CMakeFiles/text2tt.dir/tt_text.c.o
Scanning dependencies of target tt2text
[  8%] Building C object src/CMakeFiles/tt2text.dir/tt_text.c.o
[  8%] Linking C static library libgeotranz.a
[  8%] Linking C executable tt2text
[  8%] Linking C executable text2tt
[  8%] Built target tt2text
[  8%] Built target text2tt
Scanning dependencies of target gen_packets
Scanning dependencies of target atest
[  8%] Built target geotranz
Scanning dependencies of target aclients
[  9%] Building C object src/CMakeFiles/decode_aprs.dir/decode_aprs.c.o
[  9%] Building C object src/CMakeFiles/aclients.dir/aclients.c.o
[  9%] Building C object src/CMakeFiles/gen_packets.dir/gen_packets.c.o
[ 10%] Building C object src/CMakeFiles/atest.dir/atest.c.o
[ 11%] Building C object src/CMakeFiles/aclients.dir/ax25_pad.c.o
[ 11%] Building C object src/CMakeFiles/atest.dir/ais.c.o
[ 12%] Building C object src/CMakeFiles/gen_packets.dir/ax25_pad.c.o
[ 12%] Building C object src/CMakeFiles/aclients.dir/fcs_calc.c.o
[ 13%] Building C object src/CMakeFiles/atest.dir/demod.c.o
[ 15%] Building C object src/CMakeFiles/aclients.dir/textcolor.c.o
[ 15%] Building C object src/CMakeFiles/decode_aprs.dir/ais.c.o
[ 15%] Linking C executable aclients
[ 15%] Built target aclients
Scanning dependencies of target kissutil
[ 15%] Building C object src/CMakeFiles/atest.dir/demod_afsk.c.o
[ 16%] Building C object src/CMakeFiles/kissutil.dir/kissutil.c.o
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[ 18%] Building C object src/CMakeFiles/gen_packets.dir/fx25_init.c.o
[ 18%] Building C object src/CMakeFiles/decode_aprs.dir/ax25_pad.c.o
[ 18%] Building C object src/CMakeFiles/kissutil.dir/kiss_frame.c.o
[ 19%] Building C object src/CMakeFiles/atest.dir/demod_psk.c.o
[ 19%] Building C object src/CMakeFiles/gen_packets.dir/fx25_send.c.o
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[ 22%] Building C object src/CMakeFiles/gen_packets.dir/fcs_calc.c.o
[ 22%] Building C object src/CMakeFiles/atest.dir/demod_9600.c.o
[ 23%] Building C object src/CMakeFiles/gen_packets.dir/gen_tone.c.o
[ 24%] Building C object src/CMakeFiles/atest.dir/dsp.c.o
[ 24%] Building C object src/CMakeFiles/gen_packets.dir/morse.c.o
[ 25%] Building C object src/CMakeFiles/decode_aprs.dir/dwgpsnmea.c.o
[ 25%] Building C object src/CMakeFiles/atest.dir/fx25_extract.c.o
[ 26%] Building C object src/CMakeFiles/gen_packets.dir/dtmf.c.o
[ 26%] Building C object src/CMakeFiles/decode_aprs.dir/dwgps.c.o
[ 26%] Building C object src/CMakeFiles/kissutil.dir/fcs_calc.c.o
[ 27%] Building C object src/CMakeFiles/atest.dir/fx25_init.c.o
[ 27%] Building C object src/CMakeFiles/gen_packets.dir/textcolor.c.o
[ 29%] Building C object src/CMakeFiles/kissutil.dir/textcolor.c.o
[ 30%] Building C object src/CMakeFiles/decode_aprs.dir/dwgpsd.c.o
[ 31%] Building C object src/CMakeFiles/gen_packets.dir/dsp.c.o
[ 31%] Building C object src/CMakeFiles/kissutil.dir/serial_port.c.o
[ 31%] Building C object src/CMakeFiles/decode_aprs.dir/serial_port.c.o
[ 31%] Building C object src/CMakeFiles/atest.dir/fx25_rec.c.o
[ 32%] Building C object src/CMakeFiles/kissutil.dir/dtime_now.c.o
[ 33%] Building C object src/CMakeFiles/decode_aprs.dir/symbols.c.o
[ 33%] Linking C executable gen_packets
[ 33%] Built target gen_packets
[ 33%] Building C object src/CMakeFiles/kissutil.dir/dwsock.c.o
Scanning dependencies of target ttcalc
/home/pi/direwolf/src/symbols.c: In function ‘symbols_init’:
/home/pi/direwolf/src/symbols.c:409:6: warning: ‘strncpy’ output may be truncated copying 29 bytes from a string of length 194 [-Wstringop-truncation]
  409 |      strncpy(new_sym_ptr[new_sym_len].description, stuff+COL6_DESC, NEW_SYM_DESC_LEN);
      |      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[ 34%] Building C object src/CMakeFiles/ttcalc.dir/ttcalc.c.o
[ 36%] Linking C executable kissutil
[ 36%] Built target kissutil
[ 36%] Building C object src/CMakeFiles/decode_aprs.dir/textcolor.c.o
[ 36%] Building C object src/CMakeFiles/ttcalc.dir/ax25_pad.c.o
[ 37%] Building C object src/CMakeFiles/atest.dir/hdlc_rec.c.o
[ 38%] Building C object src/CMakeFiles/decode_aprs.dir/fcs_calc.c.o
[ 39%] Building C object src/CMakeFiles/ttcalc.dir/fcs_calc.c.o
[ 39%] Building C object src/CMakeFiles/atest.dir/hdlc_rec2.c.o
[ 40%] Building C object src/CMakeFiles/atest.dir/multi_modem.c.o
[ 40%] Building C object src/CMakeFiles/decode_aprs.dir/latlong.c.o
[ 41%] Building C object src/CMakeFiles/decode_aprs.dir/log.c.o
Scanning dependencies of target log2gpx
[ 41%] Building C object src/CMakeFiles/atest.dir/rrbb.c.o
[ 43%] Building C object src/CMakeFiles/log2gpx.dir/log2gpx.c.o
[ 43%] Building C object src/CMakeFiles/ttcalc.dir/textcolor.c.o
[ 43%] Building C object src/CMakeFiles/decode_aprs.dir/telemetry.c.o
[ 45%] Building C object src/CMakeFiles/atest.dir/fcs_calc.c.o
[ 45%] Linking C executable ttcalc
[ 44%] Building C object src/CMakeFiles/log2gpx.dir/textcolor.c.o
[ 46%] Building C object src/CMakeFiles/decode_aprs.dir/tt_text.c.o
[ 46%] Built target ttcalc
[ 46%] Building C object src/CMakeFiles/atest.dir/ax25_pad.c.o
[ 47%] Building C object src/CMakeFiles/atest.dir/decode_aprs.c.o
[ 48%] Linking C executable log2gpx
[ 48%] Built target log2gpx
[ 48%] Building C object src/CMakeFiles/atest.dir/dwgpsnmea.c.o
[ 50%] Building C object src/CMakeFiles/atest.dir/dwgps.c.o
[ 50%] Linking C executable decode_aprs
Scanning dependencies of target appserver
[ 51%] Building C object src/CMakeFiles/appserver.dir/appserver.c.o
[ 51%] Built target decode_aprs
[ 51%] Building C object src/CMakeFiles/appserver.dir/agwlib.c.o
/home/pi/direwolf/src/appserver.c: In function ‘agw_cb_D_connected_data’:
/home/pi/direwolf/src/appserver.c:501:65: warning: ‘%-9s’ directive output may be truncated writing between 9 and 479 bytes into a region of size between 54 and 64 [-Wformat-truncation=]
  501 |        snprintf (greeting, sizeof(greeting), "  %2d       %d    %-9s [time later]\r",
      |                                                                 ^~~~
/home/pi/direwolf/src/appserver.c:501:8: note: ‘snprintf’ output between 40 and 520 bytes into a destination of size 80
  501 |        snprintf (greeting, sizeof(greeting), "  %2d       %d    %-9s [time later]\r",
      |        ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  502 |    n, session[n].channel, session[n].client_addr);
      |    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[ 52%] Building C object src/CMakeFiles/appserver.dir/dwsock.c.o
Scanning dependencies of target direwolf
[ 52%] Building C object src/CMakeFiles/appserver.dir/dtime_now.c.o
[ 52%] Building C object src/CMakeFiles/atest.dir/dwgpsd.c.o
[ 53%] Building C object src/CMakeFiles/appserver.dir/ax25_pad.c.o
[ 54%] Building C object src/CMakeFiles/atest.dir/serial_port.c.o
[ 54%] Building C object src/CMakeFiles/atest.dir/telemetry.c.o
[ 55%] Building C object src/CMakeFiles/atest.dir/dtime_now.c.o
[ 56%] Building C object src/CMakeFiles/direwolf.dir/direwolf.c.o
[ 56%] Building C object src/CMakeFiles/atest.dir/latlong.c.o
[ 58%] Building C object src/CMakeFiles/atest.dir/symbols.c.o
[ 58%] Building C object src/CMakeFiles/atest.dir/tt_text.c.o
/home/pi/direwolf/src/symbols.c: In function ‘symbols_init’:
/home/pi/direwolf/src/symbols.c:409:6: warning: ‘strncpy’ output may be truncated copying 29 bytes from a string of length 194 [-Wstringop-truncation]
  409 |      strncpy(new_sym_ptr[new_sym_len].description, stuff+COL6_DESC, NEW_SYM_DESC_LEN);
      |      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[ 58%] Building C object src/CMakeFiles/direwolf.dir/ais.c.o
[ 59%] Building C object src/CMakeFiles/direwolf.dir/aprs_tt.c.o
[ 59%] Building C object src/CMakeFiles/appserver.dir/fcs_calc.c.o
[ 60%] Building C object src/CMakeFiles/atest.dir/textcolor.c.o
[ 61%] Building C object src/CMakeFiles/appserver.dir/textcolor.c.o
Scanning dependencies of target ll2utm
[ 61%] Linking C executable atest
[ 61%] Building C object src/CMakeFiles/ll2utm.dir/ll2utm.c.o
[ 61%] Linking C executable appserver
[ 61%] Built target appserver
[ 61%] Building C object src/CMakeFiles/direwolf.dir/audio_stats.c.o
[ 61%] Built target atest
[ 62%] Building C object src/CMakeFiles/direwolf.dir/ax25_link.c.o
[ 62%] Building C object src/CMakeFiles/direwolf.dir/ax25_pad.c.o
[ 63%] Building C object src/CMakeFiles/ll2utm.dir/textcolor.c.o
[ 65%] Building C object src/CMakeFiles/direwolf.dir/ax25_pad2.c.o
[ 65%] Linking C executable ll2utm
[ 65%] Built target ll2utm
[ 65%] Building C object src/CMakeFiles/direwolf.dir/beacon.c.o
Scanning dependencies of target utm2ll
[ 65%] Building C object src/CMakeFiles/utm2ll.dir/utm2ll.c.o
[ 66%] Building C object src/CMakeFiles/utm2ll.dir/textcolor.c.o
[ 67%] Linking C executable utm2ll
[ 68%] Building C object src/CMakeFiles/direwolf.dir/config.c.o
[ 68%] Built target utm2ll
[ 68%] Building C object src/CMakeFiles/direwolf.dir/decode_aprs.c.o
[ 69%] Building C object src/CMakeFiles/direwolf.dir/dedupe.c.o
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[ 72%] Building C object src/CMakeFiles/direwolf.dir/digipeater.c.o
[ 73%] Building C object src/CMakeFiles/direwolf.dir/cdigipeater.c.o
[ 73%] Building C object src/CMakeFiles/direwolf.dir/dlq.c.o
[ 74%] Building C object src/CMakeFiles/direwolf.dir/dsp.c.o
[ 74%] Building C object src/CMakeFiles/direwolf.dir/dtime_now.c.o
[ 75%] Building C object src/CMakeFiles/direwolf.dir/dtmf.c.o
[ 75%] Building C object src/CMakeFiles/direwolf.dir/dwgps.c.o
[ 76%] Building C object src/CMakeFiles/direwolf.dir/dwsock.c.o
[ 76%] Building C object src/CMakeFiles/direwolf.dir/encode_aprs.c.o
[ 77%] Building C object src/CMakeFiles/direwolf.dir/fcs_calc.c.o
[ 77%] Building C object src/CMakeFiles/direwolf.dir/fx25_encode.c.o
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[ 79%] Building C object src/CMakeFiles/direwolf.dir/fx25_init.c.o
[ 80%] Building C object src/CMakeFiles/direwolf.dir/fx25_rec.c.o
[ 80%] Building C object src/CMakeFiles/direwolf.dir/fx25_send.c.o
[ 81%] Building C object src/CMakeFiles/direwolf.dir/fx25_auto.c.o
[ 81%] Building C object src/CMakeFiles/direwolf.dir/gen_tone.c.o
[ 82%] Building C object src/CMakeFiles/direwolf.dir/hdlc_rec.c.o
[ 82%] Building C object src/CMakeFiles/direwolf.dir/hdlc_rec2.c.o
[ 83%] Building C object src/CMakeFiles/direwolf.dir/hdlc_send.c.o
[ 83%] Building C object src/CMakeFiles/direwolf.dir/igate.c.o
[ 84%] Building C object src/CMakeFiles/direwolf.dir/kiss_frame.c.o
[ 84%] Building C object src/CMakeFiles/direwolf.dir/kiss.c.o
[ 86%] Building C object src/CMakeFiles/direwolf.dir/kissserial.c.o
[ 86%] Building C object src/CMakeFiles/direwolf.dir/kissnet.c.o
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[ 87%] Building C object src/CMakeFiles/direwolf.dir/log.c.o
[ 88%] Building C object src/CMakeFiles/direwolf.dir/morse.c.o
[ 88%] Building C object src/CMakeFiles/direwolf.dir/multi_modem.c.o
[ 89%] Building C object src/CMakeFiles/direwolf.dir/waypoint.c.o
[ 89%] Building C object src/CMakeFiles/direwolf.dir/serial_port.c.o
[ 90%] Building C object src/CMakeFiles/direwolf.dir/pfilter.c.o
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[ 93%] Building C object src/CMakeFiles/direwolf.dir/server.c.o
[ 93%] Building C object src/CMakeFiles/direwolf.dir/symbols.c.o
/home/pi/direwolf/src/symbols.c: In function ‘symbols_init’:
/home/pi/direwolf/src/symbols.c:409:6: warning: ‘strncpy’ output may be truncated copying 29 bytes from a string of length 194 [-Wstringop-truncation]
  409 |      strncpy(new_sym_ptr[new_sym_len].description, stuff+COL6_DESC, NEW_SYM_DESC_LEN);
      |      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
[ 94%] Building C object src/CMakeFiles/direwolf.dir/telemetry.c.o
[ 94%] Building C object src/CMakeFiles/direwolf.dir/textcolor.c.o
[ 95%] Building C object src/CMakeFiles/direwolf.dir/tt_text.c.o
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[ 96%] Building C object src/CMakeFiles/direwolf.dir/xid.c.o
[ 97%] Building C object src/CMakeFiles/direwolf.dir/xmit.c.o
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[ 98%] Building C object src/CMakeFiles/direwolf.dir/mheard.c.o
[100%] Building C object src/CMakeFiles/direwolf.dir/audio.c.o
[100%] Linking C executable direwolf
[100%] Built target direwolf

My system
Linux raspberrypi 4.9.35-v7+ #1014 SMP Fri Jun 30 14:47:43 BST 2017 armv7l GNU/Linux

cat /etc/issue
Raspbian GNU/Linux 8 \n \l