Sent from my iPhone
> On Nov 7, 2018, at 2:36 AM, Jiang Huiyou <jhy19941...@hotmail.com> wrote:
>
> Hi,
> My user-space TCP/IP stack works fine on DPDK 17.02, now I upgrade it to
> 18.02. And then I use wrk http benchmark to test my stack, it work well
> fine, but after a while, it couldn't send packet. I debug with gdb and find
> the rte_eth_tx_burst always return 0, which means there is no available
> transmit descriptor. And then I enable DPDK debug mode, the ixgbe_xmit_pkts
> has been called to send packets (My NIC is Intel 82599ES 10G) and it called
> ixgbe_xmit_cleanup to recycle used transmit descriptor, but
> ixgbe_xmit_cleanup always return -1. The relevant code is blew.
>
Can you make sure the tx flush threshold?
Some of the rx/tx rings were increased and if you do not have enough transmit
traffic it can seem like it never does a cleanup. This is just guess try to
make sure you have enough tx buffers allocated and rx as well.
Hope that helps
> /* Check to make sure the last descriptor to clean is done */
> desc_to_clean_to = sw_ring[desc_to_clean_to].last_id;
> status = txr[desc_to_clean_to].wb.status;
> if (!(status & rte_cpu_to_le_32(IXGBE_TXD_STAT_DD))) {
> PMD_TX_FREE_LOG(DEBUG,
> "TX descriptor %4u is not done"
> "(port=%d queue=%d)",
> desc_to_clean_to,
> txq->port_id, txq->queue_id);
> /* Failed to clean any descriptors, better luck next time */
> return -(1);
> }
>
> I'm stuck here, and wonder how DPDK upgrade brings up this issue. Btw, there
> was a similar mail which encountered the same issue,
> http://mails.dpdk.org/archives/dev/2017-August/073240.html, but I find no
> final solution for it.
>
> Thanks a lot for your time, and dying for your reply!
>
> Huiyou
>
