Ha I see, then I guess you can alloc multiple heads at once and then use vlib_buffer_attach_clone(). You usually need to duplicate the head of the packet you're cloning because it's going to be rewritten when you forward (ttl decrement, l2 rewrite etc).
ben > -----Original Message----- > From: vpp-dev@lists.fd.io <vpp-dev@lists.fd.io> On Behalf Of NUAA?? > Sent: Tuesday, August 2, 2022 9:46 > To: vpp-dev@lists.fd.io > Subject: Re: [vpp-dev] Copy packet forwarding performance issues > > Hi, ben > Thanks for your hint, i used vlib_buffer_clone() to copy packet， but the > performance is drop > i found that vlib_buffer_clone is use vlib_buffer_alloc()，is there other > way to improve performance？ > > by the way，i also used rte_mbuf_from_vlib_buffer() to use dpdk‘s rte_mbuf > to use dpdk buf refcnt， but this way need to copy vpp's buffer to dpdk > buffer， > can vpp use dpdk's rte_mbuf directly? > > best > wanghe > > Benoit Ganne (bganne) via lists.fd.io <http://lists.fd.io> > <bganne=cisco....@lists.fd.io <mailto:cisco....@lists.fd.io> > 于2022年8月 > 1日周一 15:08写道： > > > You probably want to use vlib_buffer_clone() instead. > > Best > ben > > > -----Original Message----- > > From: vpp-dev@lists.fd.io <mailto:vpp-dev@lists.fd.io> <vpp- > d...@lists.fd.io <mailto:vpp-dev@lists.fd.io> > On Behalf Of NUAA?? > > Sent: Monday, August 1, 2022 4:53 > > To: vpp-dev@lists.fd.io <mailto:vpp-dev@lists.fd.io> > > Subject: [vpp-dev] Copy packet forwarding performance issues > > > > Hi，vpp experts > > I have a task that send one packet to three NIC > > my method is that use "vlib_buffer_alloc" function to copy three > buffer， > > but this method is poor performance，about that if vpp is 10G bps > ， once > > copy will reduce 1.5G bps > > > > is vpp has like dpdk buffer use refcnt count to avoid copy buffer > ？ can > > you give me some suggestions to send packet with high performence > ？ > > > > Best wish > > wanghe > > > > > > > > >
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