Re: Multiple Tx-Queues not working as expected

[Rajasekhar Pulluru <pullururajasekhar@gmail.com>]

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Ok Stephen, thanks for the information, I can try that.

One of the problems I see with single Tx Queue mode is that Ixia reports
packet drops, though I confirmed with the help of counters (before invoking
tx burst) that all packets are being sent-out. Dumping HW counters don't
report any drops in TX.
Is there a mechanism in DPDK to debug this?

Thanks & Regards,
Rajasekhar

On Fri, Feb 17, 2023 at 1:21 AM Stephen Hemminger <
stephen@networkplumber.org> wrote:

> On Thu, 16 Feb 2023 23:40:27 +0530
> Rajasekhar Pulluru <pullururajasekhar@gmail.com> wrote:
>
> > Hi Team,
> >
> > I am trying to set-up 8 Tx-Queues (but only 1 Rx-Queue) and burst traffic
> > out of different Tx-Queues from the same cpu core on an ixgbe nic (10G).
> > Although transmitted packets reach the peer, reading the statistics
> > indicates only the Tx-q[0] has non-zero packets and bytes count, the rest
> > of the Tx-q[1] to Tx-q[7] all have zero packets and bytes count.
> >
> > I am following the below sequence.
> >
> > 1. configuration
> > rte_eth_dev_configure(port-id, 1 /* only 1 rx-q */, 8 /* tx-queues */,
> > &dev_conf /* memset of 0 on this dev_conf done */);
> >
> > 2. tx queue set-up
> > struct rte_eth_dev_info dev_info;
> > rte_eth_dev_info_get(port-id, &dev_info);
> >
> > struct rte_eth_txconf tx_conf;
> > memcpy(&tx_conf, &dev_info.default_txconf, sizeof tx_conf);
> > for(i=0; i<8; i++) {
> > rte_eth_tx_queue_setup(port-id, i /* queue-id */, 1024 /* num_of_txdesc
> */,
> > numa_node, &tx_conf;)
> > }
> >
> > 3. rx queue set-up
> > rte_eth_rx_queue_setup(port-id, 0, 1024 /* num_of_rxdesc */, &rx_conf,
> > mbuf_pool);
> >
> > 4. start the port
> > rte_eth_dev_start(port-id);
> >
> > 5. call the below tx burst function with different queue-id (range 0 to
> 7)
> > every-time for every burst of new packets to be transmitted
> > rte_eth_tx_burst(port-id, queue-id, pkts_burst, nb_pkts_burst);
> >
> > 6. read stats using rte_eth_xstats_get and verified that only the first
> > tx-q has non-zero packets and bytes count, rest of the tx-q's have 0
> > packets and bytes count.
> >
> > What could be wrong here? Appreciate any help.
> >
> > Thanks & Regards,
> > Rajasekhar
> > ReplyForward
>
> Depending on the type of NIC, some share a signal completion channel
> for both RX and TX. If the Rx channel is not polled, than transmit
> completions
> may not happen.
>

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