Can't build on ARM-based machine

[eecheng87]

Hi,

I try to build latest Seastar on AWS EC2 instance (c6gn.xlarge), which uses arm64 architecture. There're some error after configuring like: ./configure.py --mode=release --enable-dpdk:

FAILED: _cooking/ingredient/dpdk/stamp/ingredient_dpdk-install /home/ubuntu/seastar/build/release/_cooking/ingredient/dpdk/stamp/ingredient_dpdk-install
cd /home/ubuntu/seastar/build/release/_cooking/ingredient/dpdk/build && /usr/bin/cmake -E chdir /home/ubuntu/seastar/dpdk make -j 4 "EXTRA_CFLAGS=-Wno-error -fcommon" O=/home/ubuntu/seastar/build/release/_cooking/ingredient/dpdk/build DESTDIR=/home/ubuntu/seastar/build/release/_cooking/stow/dpdk T=arm64-armv8a-linuxapp-gcc install && /usr/bin/cmake -E touch /home/ubuntu/seastar/build/release/_cooking/ingredient/dpdk/stamp/ingredient_dpdk-install
Using local configuration
cc1: error: unknown value ‘corei7’ for ‘-march’
cc1: note: valid arguments are: armv8-a armv8.1-a armv8.2-a armv8.3-a armv8.4-a armv8.5-a armv8.6-a armv8-r native
== Build lib
cc1: error: unknown value ‘corei7’ for ‘-march’
cc1: note: valid arguments are: armv8-a armv8.1-a armv8.2-a armv8.3-a armv8.4-a armv8.5-a armv8.6-a armv8-r native
== Build lib/librte_kvargs
== Build lib/librte_cfgfile
cc1: error: unknown value ‘corei7’ for ‘-march’
cc1: note: valid arguments are: armv8-a armv8.1-a armv8.2-a armv8.3-a armv8.4-a armv8.5-a armv8.6-a armv8-r native
cc1: error: unknown value ‘corei7’ for ‘-march’
cc1: note: valid arguments are: armv8-a armv8.1-a armv8.2-a armv8.3-a armv8.4-a armv8.5-a armv8.6-a armv8-r native

I'm wondering is current Seastar support on arm64 machine? or I'm missing some option in configuration list?

Thanks in advance!

[avikivity]

Try to disable DPDK. Some glue logic is missing from the DPDK integration.

[eecheng87]

I actually need to use --dpdk-pmd option and already build DPDK from the source of another repository. If I disable DPDK in seastar to skip the integration of DPDK, I can't use --dpdk-pmd option. Any approach to skip integration but support --dpdk-pmd option?

[simini]

I have the same issue, and I also need the dpdk -pmd option. Have you found a way to fix the integration?

[tchaikov]

by default, dpdk uses "native". when it fails to find SSE42 support, and it uses "corei7" to enforce the SSE42 enabling. so we need to instruct the building system to use a different DPDK machine.

i think, probably, the solution is hidden in the --cflags option. i am able to cook DPDK with configure.py on an armv8 machine, like

$ ./configure.py --mode debug --compiler clang++-15 --c++-standard 20 \
    --enable-dpdk --cflags='-march=armv8-a'