> On 03.09.2021., at 12:05, Mrityunjay Kumar <kumarn...@gmail.com> wrote: > > Damjan Hi, > > I’m so sorry for pointing but I’d like to make sure I understood you > correctly. Since I don’t have specific case of tx-placement but please help > vpp-dev <https://lists.fd.io/g/vpp-dev/message/19192> mail readers. > · tx queues are statically mapped by vpp. > · main thread always maps to queue 0. of each interface in vpp. > · For the dpdk interfaces by default, number of vlib_mains [main > thread + workers] is equal to the number of tx queues if the dpdk driver > support such limit. > · Tx queues limit can be controlled by startup.conf section dpdk { > num-tx-queues #abc }. But it might leads to spinlock on workers threads, > refer the code. > if (xd->tx_q_used < tm->n_vlib_mains) > clib_spinlock_init (&vec_elt > (xd->tx_queues, j).lock); > > So I think, we can’t generalised workers to tx queue mapping as because, > different vpp interface can have different number of tx queues.
If VPP have more worker threads than number of TX queues on the specific interace, then VPP will share 1 queue between multiple workers for that interface. With the new tx queue infra (not yet enabled for dpdk). we allow dynamic mapping of tx queues and also sharing single queue between multiple workers. I.e. you can have 8 workers sharing 4 queues (2:1 mapping). — Damjan > > //MJ > > > Regards, > Mrityunjay Kumar. > Mobile: +91 - 9731528504 > > > > On Wed, Apr 14, 2021 at 4:54 PM Damjan Marion via lists.fd.io > <http://lists.fd.io/> <dmarion=me....@lists.fd.io > <mailto:me....@lists.fd.io>> wrote: > > >> On 14.04.2021., at 13:21, Marcos - Mgiga <mar...@mgiga.com.br >> <mailto:mar...@mgiga.com.br>> wrote: >> >> Hello, >> >> I increased VPP rx/tx queues in order to enable RSS on VPP instance. Since >> VPP is running on a NUMA system with two threads with 8 cores each, I would >> like to pin TX / RX queue to proper NUMA nodes. >> >> Using set interface rx-placement I was able to associate rx queue to desired >> cores, so I would like to know if is there any possibility to pin tx queue >> to a certain workers as well. >> > > Not at the moment. tx queues are statically mapped (0 to main thread, 1 to > worker 0, 2 to worker 1, etc.). > There are some plans to implement such capability….. > > > > > > > >
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