On 07/03/2015 12:41, Neil Green wrote:
In an attempt to squeeze all I can out of a NTP and GPS/PPS setup on the
Raspberry Pi 2 I’m starting to experiment with compile flags using GCC 4.8.
Currently I have:
CC="gcc-4.8" CFLAGS="-mcpu=cortex-a7 -mfpu=neon-vfpv4" ./configure
--enable-NMEA --enable-ATOM --enable-linuxcaps --disable-all-clocks --disable-parse-clocks
--disable-ipv6
Will attempting to optimise the build like this have any positive impact on NTP
in terms of precision, stability etc, or am I focussing on an area that will
have no benefit?
Thanks,
Neil.
==================================
Neil,
From my limited experience, improving stability etc. is best done by
tuning the NTP parameters, keeping the temperature as constant as
possible, and if you have a PPS source disabling the tickless mode in
the kernel.
If you are compiling a lot, "make -j5" speeds things up.
"--enable-linuxcaps" appear to be unnecessary, and I've not done any
comparisons by enabling or disabling different clocks, but anything to
reduce the ./configure time would be extremely welcome.
I would be most interested to hear of your results.
--
Cheers,
David
Web: http://www.satsignal.eu
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