> -----Original Message----- > From: users [mailto:[email protected]] On Behalf Of Alex Kiselev > Sent: Thursday, February 21, 2019 3:33 PM > To: [email protected] > Subject: Re: [dpdk-users] build dpdk for a cpu that doesn't support avx > > It looks like I've found a way: > > I edited $RTE_SDK/config/defconfig_x86_64-native-linuxapp-gcc > CONFIG_RTE_MACHINE="x86-64" > > and then I used > make EXTRA_CFLAGS="-march=x86-64 -mpopcnt -mmmx -msse -msse2 -msse3 -mssse3 > -msse4.1 -msse4.2 -mfpmath=sse -mpopcnt" > > The application has started successfully. > But I am wondering, maybe I've missed something and there are potential bugs > in this way? > > > Hi. > > > Is it possible to build DPDK application on a machine that do have AVX > support > > for use at another machine that doesn't have AVX feature? > > > Thanks.
Using -march to manually tune should work fine, just be aware of mistakes made; this is an error prone method.. As per the GCC docs, you can target specific CPU families, and the optimal flags will be selected: https://gcc.gnu.org/onlinedocs/gcc/x86-Options.html Example: -march=goldmont-plus With make, EXTRA_CFLAGS="-march=NAME-HERE" should work With Meson, cd <build_dir> && meson configure -Dc_args="-march=NAME-HERE" I guess there's a prettier method for meson, but the above works here :) Hope that helps, -Harry
