[dpdk-dev] [PATCH v2] mbuf: enforce alignment of mbuf private area
thomas.monjalon at 6wind.com
Mon Aug 3 00:35:32 CEST 2015
> > It looks better to have a data buffer address that is aligned to
> > 8 bytes. This is the case when there is no mbuf private area, but
> > if there is one, the alignment depends on the size of this area
> > that is located between the mbuf structure and the data buffer.
> > Indeed, some drivers expects to have the buffer address aligned
> > to an even address, and moreover an unaligned buffer may impact
> > the performance when accessing to network headers.
> > Add a check in rte_pktmbuf_pool_create() to verify the alignment
> > constraint before creating the mempool. For applications that use
> > the alternative way (direct call to rte_mempool_create), also
> > add an assertion in rte_pktmbuf_init().
> > By the way, also add the MBUF log type.
> > Signed-off-by: Olivier Matz <olivier.matz at 6wind.com>
> Acked-by: Konstantin Ananyev <konstantin.ananyev at intel.com>
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