On 21.09.2016 18:14, Alexei Starovoitov wrote:
> On Wed, Sep 21, 2016 at 12:10:55PM +0200, Hannes Frederic Sowa wrote:
>> On 20.09.2016 20:57, Sowmini Varadhan wrote:
>>> The vxlan header may not be aligned to 4 bytes in
>>> vxlan_build_skb (e.g., for MLD packets). This patch
>>> avoids unaligned access traps from vxlan_build_skb
>>> (in platforms like sparc) by making struct vxlanhdr __packed.
>>> Signed-off-by: Sowmini Varadhan <sowmini.varad...@oracle.com>
>> Performance wise this should only affect code generation for archs where
>> it matters anyway.
> I think it's the opposite. Even on x86 compiler will use byte loads.

I checked that on x86-64 actually. Also clearly visible here:



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