By default we do not want to build Open vSwitch for a particular CPU, we
want to create a build that can be distributed to every CPU of the
architecture (e.g. amd64).
Unfortunately, this not entirely possible for with DPDK, because rte_memcpy
(included by the headers in netdev-dpdk) requires SSSE3. The 'default'
machine in DPDK (which, if I'm not mistaken, should produce the most
distributable build) does not work on every amd64, but requires
-march=core2, i.e. -mssse3.
We shouldn't change this unless OvS+DPDK cannot work without sse4.2. I
don't think this is the case, right?
Thanks,
Daniele
2016-08-14 11:35 GMT-07:00 Bhanuprakash Bodireddy <
bhanuprakash.bodire...@intel.com>:
> On processors with SSE4.2 instruction set support, CRC32 intrinsics can
> be used for efficient hash computation.
>
> Update the m4_translit to convert '.' to '_' that otherwise cause 'bad
> substitution' error when configuring OVS DPDK with msse4.2 support.
>
> ./configure: line 21027: ${ovs_cv__msse4.2+:}: bad substitution
>
> Signed-off-by: Bhanuprakash Bodireddy <bhanuprakash.bodire...@intel.com>
> ---
> acinclude.m4 | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/acinclude.m4 b/acinclude.m4
> index aa57b47..93c7a5a 100644
> --- a/acinclude.m4
> +++ b/acinclude.m4
> @@ -280,7 +280,7 @@ AC_DEFUN([OVS_CHECK_DPDK], [
> OVS_LDFLAGS="$OVS_LDFLAGS -L$DPDK_LIB_DIR"
> fi
> OVS_CFLAGS="$OVS_CFLAGS -I$DPDK_INCLUDE"
> - OVS_ENABLE_OPTION([-mssse3])
> + OVS_ENABLE_OPTION([-msse4.2])
>
> # DPDK pmd drivers are not linked unless --whole-archive is used.
> #
> @@ -776,7 +776,7 @@ dnl gives unlimited permission to copy and/or
> distribute it,
> dnl with or without modifications, as long as this notice is preserved.
>
> AC_DEFUN([_OVS_CHECK_CC_OPTION], [dnl
> - m4_define([ovs_cv_name], [ovs_cv_[]m4_translit([$1], [-=], [__])])dnl
> + m4_define([ovs_cv_name], [ovs_cv_[]m4_translit([$1], [-=.], [___])])dnl
> AC_CACHE_CHECK([whether $CC accepts $1], [ovs_cv_name],
> [ovs_save_CFLAGS="$CFLAGS"
> dnl Include -Werror in the compiler options, because without -Werror
> --
> 2.4.11
>
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> http://openvswitch.org/mailman/listinfo/dev
>
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