Hi Stephen,
The userspace fastpath backed by DPDK, more than other OVS components,
performs a lot worse when optimizations are disabled. We ended up
recommending "extreme" optimization flags in INSTALL.md ("-O3
-march=native", ok if you don't need to run your build elsewhere).
That said, autoconf by default builds with CFLAGS="-g -O2", but if you
supply your own CFLAGS somehow, the default is overridden (Do not
quote me on this, I'm not an autoconf expert. See
https://www.gnu.org/savannah-checkouts/gnu/autoconf/manual/autoconf-2.69/html_node/C-Compiler.html#C-Compiler
and
http://www.gnu.org/software/autoconf/manual/autoconf-2.66/html_node/Preset-Output-Variables.html).
Users are not supposed to see OVS_CFLAGS: that was introduced by
Thomas in the commit you linked to avoid overwriting user provided
CFLAGS (it should be used by the autoconf scripts only). I believe you
can use CFLAGS for all practical purposes.
To add verbosity to make the "V=1" argument can be used. This will
display the whole command line used to invoke the compiler.
Hope this helped,
Daniele
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