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From: "Mcnamara, John" <john.mcnamara@intel.com>
To: "Kavanagh, Mark B" <mark.b.kavanagh@intel.com>, "dev@dpdk.org"
 <dev@dpdk.org>
Thread-Topic: rte_memcpy.h: additional cflags required with OVS
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Date: Mon, 9 Mar 2015 17:51:23 +0000
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Subject: Re: [dpdk-dev] rte_memcpy.h: additional cflags required with OVS
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> -----Original Message-----
> From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Kavanagh, Mark B
> Sent: Monday, March 9, 2015 4:44 PM
> To: dev@dpdk.org
> Subject: [dpdk-dev] rte_memcpy.h: additional cflags required with OVS
>=20
> Compilation of Open vSwitch fails when linked against current HEAD of DPD=
K
> (f2552cd5).
>=20
> The source of this issue appears to be commit ID 9144d6b: "eal/x86:
> optimize memcpy for SSE and AVX", and can be resolved by passing an
> additional argument to OVS when building same (CFLAGS=3D"-march=3Dnative"=
).
> It seems that without this flag, OVS doesn't pick up one or more SSE
> #defines in DPDK, and doesn't include a relevant intrinsic header
> (emmintrin.h), leading to an 'implicit declaration' error for instrinsic
> '_mm_storeu_si128'.
>=20
> Has anyone else observed this behavior?

Hi Mark,

I can confirm that behavior and that it was introduced by the new optimized=
 memcpy. I'll look into how it might be mitigated, for Open VSwitch with DP=
DK.

In the meantime the following might work for OVS:

    $ ./configure CFLAGS=3D'-Wno-bad-function-cast -march=3Dnative' --with-=
dpdk=3D$DPDK_BUILD
    $ make

But I'll look into it in more detail and update.

John
--=20