2016-06-27 10:27, Olivier Matz: > On 06/27/2016 10:21 AM, Ananyev, Konstantin wrote: > > From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Keith Wiles > >> Move the next pointer to the first cacheline of the rte_mbuf structure > >> and move the offload values to the second cacheline to give better > >> performance to applications using chained mbufs. > >> > >> Enabled by a configuration option CONFIG_RTE_MBUF_CHAIN_FRIENDLY default > >> is set to No. > > > > First, it would make ixgbe and i40e vector RX functions to work incorrectly. > > Second, I don't think we can afford to allow people swap mbuf fields in the > > way they like. > > Otherwise we'll end-up with totally unmaintainable code pretty soon. > > So NACK. > > +1
To be more precise, the arrangement of fields in rte_mbuf is open to debate and changes. There is a recent discussion here: http://dpdk.org/ml/archives/dev/2016-May/039483.html I think we must try to improve few things in mbuf during the 16.11 cycle. But it must not be allowed to have a build option to adapt this structure or any other API. There is only one DPDK API for a given version.