Re: Multiple Tx-Queues not working as expected

[Rajasekhar Pulluru <pullururajasekhar@gmail.com>]

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Yes Bruce, rte_eth_tx_burst api returns the same count as nb_pkts (4th-arg)

Thanks for pointing out the information on tracking per-queue stats
mapping, can try this out.

Thanks & Regards,
Rajasekhar

On Fri, Feb 17, 2023 at 10:09 PM Bruce Richardson <
bruce.richardson@intel.com> wrote:

> On Fri, Feb 17, 2023 at 11:30:14AM +0530, Rajasekhar Pulluru wrote:
> >    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
> >
> Hi,
>
> so long as the packets are written successfully to the TX ring, they should
> be send out ok - unless the actual packets are some way invalid, e.g.
> undersized. Are the tx_burst calls reporting that all packets are getting
> written to the ring?  All packets successfully written should be reported
> as received at the other end.
>
> In terms of the NIC TX stats, I'm not sure about for the ixgbe driver, but
> I think in some cases to get per-queue stats, you needed to set up a
> mapping of what queues you wanted to track stats for, as the NIC could only
> track a certain number of queues - fewer than that available in HW.  See
> function [1]. For tracking transmits per queue, it's generally easier just
> to have the app track the successful enqueues to the ring. This is what
> testpmd does internally for queue stats, I believe (though for port stats
> it reads hardware).
>
> /Bruce
>
> [1]
> https://doc.dpdk.org/api/rte__ethdev_8h.html#a56fae7e398b289f795a1b6256149c4f3
>

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