Den tis 5 juni 2018 kl 14:44 skrev Jesper Dangaard Brouer <bro...@redhat.com>: > > On Mon, 4 Jun 2018 14:06:00 +0200 > Björn Töpel <bjorn.to...@gmail.com> wrote: > > > Here, ndo_xsk_async_xmit is implemented. As a shortcut, the existing > > XDP Tx rings are used for zero-copy. This will result in other devices > > doing XDP_REDIRECT to an AF_XDP enabled queue will have its packets > > dropped. > > This behavior is problematic, because XDP Tx rings are smp_processor_id > based, and several RX queues can (via proc smp_affinity settings) be > assigned to the same CPU. Thus, other RX-queues (than the AF_XDP > enabled queue) can experience packet drops. And other devices doing > redirect through i40e, which happen to run on a CPU which XDP Tx queue > is "hijacked" will see dropped packets. > > Any plans to allocate/create a dedicated TX ring per AF_XDP socket? >
Yes -- again this was a shortcut, and must be addressed (for all the reasons above). Björn > -- > Best regards, > Jesper Dangaard Brouer > MSc.CS, Principal Kernel Engineer at Red Hat > LinkedIn: http://www.linkedin.com/in/brouer
