[dpdk-dev] mbuf changes

Morten Brørup mb at smartsharesystems.com
Mon Oct 31 17:05:55 CET 2016


> -----Original Message-----
> From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of Olivier Matz
> Sent: Tuesday, October 25, 2016 2:49 PM
> 
> We should keep in mind that today we have the seqn field but it is not
> used by any PMD. In case it is implemented, would it be a per-queue
> sequence number? Is it useful from an application view?
> 
> This field is only used by the librte_reorder library, and in my
> opinion, we should consider moving it in the second cache line since it
> is not filled by the PMD.

+1 because it is not filled by the NIC HW or PMD. If our argument is "better performance", I would prefer having the generic 64 bit m->userdata in cacheline0 than m->seqn.



More information about the dev mailing list